Exhibit 10.50

                          REGISTRATION RIGHTS AGREEMENT

         This  Registration  Rights Agreement is made and entered into as of the
31st day of July,  2000,  by and  among  MEDTOX  Scientific,  Inc.,  a  Delaware
corporation (the "Company"),  the Investors listed on Schedule A attached hereto
(individually,  an "Investor" and collectively,  the  "Investors"),  and Miller,
Johnson & Kuehn, Inc. ("MJK").

                                    RECITALS

     A. The  Investors  and the Company have  entered  into that  certain  Stock
Purchase Agreement, dated July 31, 2000 (the "Purchase Agreement").

     B. MJK has been retained to act as the  exclusive  agent for the Company in
connection with the offering of the Units.

         C. It is a condition to the  transactions  contemplated in the Purchase
Agreement that the Company  provide the  registration  and other rights provided
herein and the parties hereto desire to provide for such rights on the terms and
conditions contained herein.

         NOW,  THEREFORE,   in  consideration  of  the  premises  and  covenants
contained herein, the parties hereto agree as follows:

1. Defined Terms.  Unless  otherwise  noted,  all capitalized  terms used herein
shall have the meanings  afforded them in the Stock  Purchase  Agreement and the
Exhibits attached thereto.

2. Required  Registration.  Within 30 days of the Closing (the "File Date"), the
Company shall file a Registration Statement under the Securities Act of 1933, as
amended (the  "Securities  Act"),  on Form S-3 with the  Securities and Exchange
Commission  (the  "Commission")  covering  the resale of the (i) Shares and (ii)
shares of Common Stock  issuable  upon  exercise of the  Warrants  issued by the
Company  to the  Investors  and  MJK  on  the  date  hereof  (collectively,  the
"Registrable Stock"); provided,  however, that the Company will not be obligated
to file such a registration under the Securities Act:

(a) if Form S-3 or a  successor  form  thereto is not  available  to it for such
registration,  provided  that the Company has used good faith  efforts to remain
qualified to use Form S-3; or

(b) if the Company furnishes to the holders of the Registrable Stock (as defined
below) a  certificate  signed  by the Chief  Executive  Officer  of the  Company
stating that in the good faith judgment of the Company's Board of Directors, (i)
the  offering  would  interfere  in any  material  respect  with any  financing,
acquisition,  corporate  reorganization  or  other  material  transaction  under
consideration  by the Company or (ii) there is some other  material  development
relating to the condition  (financial or other) of the Company that has not been
disclosed  to the  general  public and as to which it is in the  Company's  best
interests not to disclose such  development;  provided that the aggregate period
of delay under this paragraph may not extend,  in any twelve-month  period,  for



more than 120 days  unless the holders of a majority  of the  Registrable  Stock
consent in writing to a longer delay of up to an additional 60 days.

3. Registration - General Provisions. In connection with the registration of the
Registrable Stock under the Securities Act, the Company will:

(a)  subject  to  Section  2 above,  prepare  and file  with  the  Commission  a
registration  statement with respect to the Registrable Stock, within 30 days of
the Closing date of the Purchase Agreement,  and use its commercially reasonable
efforts to cause such  registration  statement  to be declared  effective by the
Commission  subject to Section 4 below, use its commercially  reasonable efforts
keep any  such  Registration  Statement  continuously  effective,  supplemented,
amended and current until such time as may be reasonably necessary to effect the
sale of such securities, but not to exceed the earlier of the date on which: (i)
all  Registrable  Stock has been sold,  or (ii) three years after the date it is
declared effective by the Commission;

(b)      subject to Section 4 below,  prepare and file with the Commission  such
         amendments  to  such  Registration  Statement  and  supplements  to the
         prospectus   contained  therein  as  may  be  necessary  to  keep  such
         Registration  Statement  effective  for the period  required by Section
         3(a) above;

(c)      provide one counsel, selected by and acting on behalf of the Investors,
         with reasonable  opportunities  to review and comment on, and otherwise
         participate in, the preparation of such Registration Statement;

(d)      furnish to the Investors and MJK participating in such registration and
         to the  underwriters of the securities being  registered,  if any, such
         reasonable number of copies of the Registration Statement,  preliminary
         prospectus,  final prospectus and such other documents as the Investors
         and  underwriters  may  reasonably  request in order to facilitate  the
         public offering of such securities;

(e) use its diligent,  good faith efforts to register or qualify the  securities
covered by such  Registration  Statement under such state securities or blue sky
laws of such jurisdictions as the Investors may reasonably request,  except that
the Company  shall not for any purpose be required to execute a general  consent
to service of process (which shall not include a "Uniform  Consent to Service of
Process" or other  similar  consent to service of process  which relates only to
actions  or  proceedings  arising  out of or in  connection  with  the  sale  of
securities,  or out of a violation  of the laws of the  jurisdiction  requesting
such  consent)  or to qualify to do  business  as a foreign  corporation  in any
jurisdiction wherein it is not so qualified;

(f)      notify the Investors and MJK,  promptly  after it shall receive  notice
         thereof, of the time when such Registration Statement has been declared
         effective by the Commission or a supplement to any prospectus forming a
         part of such Registration Statement has been filed with the Commission;


          (g)  notify  the  Investors  and MJK  promptly  of any  request by the
     Commission for the amending or supplementing of such Registration Statement
     or prospectus or for additional information;

(h)      prepare and file with the Commission,  promptly upon the request of the
         Investors, any amendments or supplements to such Registration Statement
         or  prospectus  which,  in the opinion of counsel for the Investors and
         MJK (and  concurred in by counsel for the Company),  is required  under
         the Securities Act or the rules and regulations  promulgated thereunder
         in connection with the  distribution  of the  Registrable  Stock by the
         Investors;

(i)      subject  to  Section  4  below,  prepare  and  promptly  file  with the
         Commission  and  promptly  notify the  Investors  of the filing of such
         amendment or supplement to such Registration Statement or prospectus as
         may be necessary to correct any statements or omissions if, at the time
         when a  prospectus  relating  to  such  securities  is  required  to be
         delivered  under the  Securities  Act, any event shall have occurred as
         the result of which any such prospectus or any other prospectus as then
         in effect would include an untrue  statement of a material fact or omit
         to state any material fact necessary to make the statements therein, in
         the light of the circumstances in which they were made, not misleading;

(j)      advise the Investors and MJK, and the Investors' and MJK's counsel,  if
         any,  promptly  after it  shall  receive  notice  or  obtain  knowledge
         thereof, of the issuance of any stop order by the Commission suspending
         the effectiveness of such  Registration  Statement or the initiation or
         threatening  of any  proceeding  for that  purpose and promptly use its
         commercially  reasonable  efforts to prevent  the  issuance of any stop
         order or to obtain its withdrawal if such stop order should be issued;

(k)      not file any amendment or supplement to such Registration  Statement or
         prospectus to which the Investors shall have reasonably objected on the
         grounds  that  such  amendment  or  supplement  does not  comply in all
         material  respects with the  requirements  of the Securities Act or the
         rules  and  regulations  promulgated  thereunder,   after  having  been
         furnished  with a copy thereof at least five business days prior to the
         filing  thereof,  unless in the  opinion of counsel for the Company the
         filing of such  amendment  or  supplement  is  reasonably  necessary to
         protect the Company from any material  liabilities under any applicable
         federal or state law and such filing will not violate  applicable  law;
         and

(l) at the request of the Investors and/or MJK, furnish on the effective date of
the Registration  Statement and, if such  registration  includes an underwritten
public offering, at the closing provided for in the underwriting agreement:  (i)
opinions,  dated such respective dates, of the counsel  representing the Company
for the purposes of such  registration,  addressed to the underwriters,  if any,
and to the  Investors  making  such  request,  covering  such  matters  as  such
underwriters or Investors may reasonably request,  and (ii) letters,  dated such
respective  dates,  from the  independent  certified  public  accountants of the
Company, addressed to the underwriters,  if any, and to the Investors,  covering
such matters as such underwriters or Investors may reasonably  request, in which



letter such  accountants  shall state  (without  limiting the  generality of the
foregoing) that they are independent  certified  public  accountants  within the
meaning of the  Securities Act and that in the opinion of such  accountants  the
financial  statements and other  financial  data of the Company  included in the
Registration  Statement or the prospectus or any amendment or supplement thereto
comply in all material respects with the applicable  accounting  requirements of
the Securities Act.

4. Suspension of Resales.  The holders of the Registrable Stock acknowledge that
there may  occasionally  be times when the Company  must  suspend the use of the
prospectus forming a part of the Registration  Statement, in the event that Form
S-3 becomes unavailable to the Company, if the offering of the Registrable Stock
would interfere with certain material corporate  transactions or if there exists
certain material non-public information concerning the Company. Accordingly, the
Company may suspend sales pursuant to such  Registration  Statement:  (a) if the
holders of the  Registrable  Stock are  notified in writing by the Company  that
Form S-3 is not available  for the sale of securities by such holders,  for such
period of  unavailability;  and (b) for a period of up to 120 days  (unless  the
holders of at least a majority of the Registrable  Stock consent in writing to a
longer  delay of up to an  additional  60 days) if the Company  furnishes to the
holders of the  Registrable  Stock a certificate  signed by the Chief  Executive
Officer of the Company  stating that in the good faith judgment of the Company's
Board of Directors,  (i) the offering  would  interfere in any material  respect
with any  financing,  acquisition,  corporate  reorganization  or other material
transaction  under  consideration  by the  Company  or (ii)  there is some other
material  development  relating  to the  condition  (financial  or other) of the
Company that has not been  disclosed to the general public and as to which it is
in the Company's best interests not to disclose such development;  provided that
the aggregate period of delay under this subparagraph (b) may not extend, in any
twelve-month  period, for more than 120 days unless the holders of a majority of
the  Registrable  Stock  consent  in  writing  to a  longer  delay  of  up to an
additional 60 days. The Company will notify the holders of Registrable  Stock in
any of such events (in each case, a "Black Out Notice"). Each such holder agrees
that upon its  receipt  of a Black Out  Notice  such  holder  shall  immediately
discontinue  the sale of any  Registrable  Stock  pursuant  to the  Registration
Statement until such holder has received  copies of the  supplemented or amended
prospectus  referred  to in  Section  3(i) or until  such  holder is  advised in
writing that the use of the prospectus may be resumed,  and has received  copies
of any additional or supplemental  filings that are incorporated by reference in
the prospectus.  In addition,  the holder agrees that it will either (x) destroy
any  prospectuses,  other than  permanent  file  copies,  then in such  holder's
possession  which have been  replaced by the Company  with more  recently  dated
prospectuses or (y) deliver to the Company all copies, other than permanent file
copies,  then  in such  holder's  possession  of the  prospectus  covering  such
Registrable  Stock  that was  current  at the time of  receipt  of the Black Out
Notice.  The  period  during  which the  Company is  required  to  continue  the
effectiveness of a registration  statement under Section 3(a) will be tolled for
all periods of time during which resales are suspended under this Section 4.

5. Provision by Investors of Certain Information in Connection with Registration
Statement.  No Investor or MJK may include any of its  Registrable  Stock in the
Registration Statement pursuant to this Agreement unless and until such Investor
and MJK  furnishes to the Company in writing,  within 20 days after receipt of a
request  therefor,  the  information  specified in Item 507 or 508 of Regulation
S-K,  as  applicable,  of the  Securities  Act for use in  connection  with  the



Registration Statement or prospectus or preliminary prospectus included therein.
Each selling Investor and MJK agrees to promptly furnish additional  information
required to be disclosed in order to make the information  previously  furnished
to the Company by such Investor and MJK not materially misleading.

6.  Registration  Expense.  The Company shall pay all Registration  Expenses (as
defined below) in connection with the inclusion of the Registrable  Stock in any
Registration  Statement, or application to register or qualify such shares under
state securities laws, filed by the Company  hereunder,  other than as set forth
herein. For purposes of this Agreement,  the term "Registration  Expenses" means
the filing fees payable to the  Commission,  any state agency and the NASD;  the
fees and  expenses of the  Company's  legal  counsel and  independent  certified
public  accountants  in  connection  with  the  preparation  and  filing  of the
Registration  Statement (and all amendments  and  supplements  thereto) with the
Commission;  and all  expenses  relating  to the  printing  of the  Registration
Statement,  prospectuses and various agreements  executed in connection with the
Registration  Statement.  The  Company  will pay the fees and  expenses,  not to
exceed  $3,000,  of one counsel  selected by MJK to represent  the  Investors in
connection with preparation of the Registration  Statement.  Notwithstanding the
foregoing,  the  Investors  will pay the fees and  expenses  of any other  legal
counsel the Investors may engage, as well as the Investors'  proportionate share
of any custodian  fees or  commission  or discounts  which may be payable to any
underwriter.

7. Penalty  Payments.  In the event that the Company is  determined  not to have
exercised its commercially  reasonable efforts to file a Registration  Statement
relating  to the  Registrable  Stock with the  Commission  on or before the File
Date,  then,  the Company shall pay the Investors and MJK the following  amounts
("Penalty  Payments"):  (i) 1% of the purchase price of the Stock (the "Purchase
Price") paid by the  Investors  to the Company if (A) the Company is  determined
not  to  have  exercised  its  commercially   reasonable  efforts  to  file  the
Registration  Statement with the Commission by the File Date, (ii) an additional
1% of the Purchase  Price if the Company is determined not to have exercised its
commercially  reasonable efforts to cause the Registration Statement to be filed
with the Commission within 150 days of the Closing date, and (iii) an additional
3% of the Purchase Price for each 30-day period  thereafter in which the Company
is determined not to have exercised its commercially reasonable efforts to cause
the  Registration  Statement not to be filed with the Commission.  Penalties for
failure to file and/or to obtain effectiveness shall be cumulative.  The Company
shall  be  liable  to the  Investor  for a full  30-day  period,  determined  in
accordance with the above schedule, regardless of by how many days it misses one
of the  targeted  filing or effective  dates set forth  above.  All such Penalty
Payments  shall be  immediately  payable by the Company to the Investors and MJK
(on a pro rata basis  based on the number of shares of Stock  purchased  by each
under the Stock Purchase  Agreement) via wire transfer of immediately  available
funds  in the  event  that it is  determined  that the  Company  did not use its
commercially  reasonable efforts as set forth above. The Company shall be deemed
not to  have  used  its  commercially  reasonable  efforts  if the  Registration
Statement is not filed within 150 days of the Closing.

8. Indemnification. With respect to the registration of the resale of the shares
of Registrable Stock:



(a) to the fullest extent  permitted by law, the Company will indemnify and hold
harmless each Investor,  MJK, the trustees,  partners,  officers,  directors and
agents of each Investor, MJK, any underwriter (as defined in the Securities Act)
for such Investor,  MJK and each person, if any, who controls such Investor, MJK
or  underwriter  within the  meaning  of the  Securities  Act or the  Securities
Exchange  Act of 1934,  as amended  (the  "Exchange  Act"),  against any losses,
claims,  damages,  or  liabilities  (joint or  several) to which they may become
subject  under the  Securities  Act, the Exchange Act or other  federal or state
law,  insofar as such  losses,  claims,  damages or  liabilities  (or actions in
respect thereof) arise out of or are based upon any of the following statements,
omissions or violations  (collectively  a "Violation")  by the Company:  (i) any
untrue statement or alleged untrue statement of a material fact contained in the
Registration Statement, including any preliminary prospectus or final prospectus
contained therein or any amendments or supplements thereto, (ii) the omission or
alleged omission to state therein a material fact required to be stated therein,
or  necessary  to make the  statements  therein  not  misleading,  or (iii)  any
violation  or alleged  violation  by the  Company  of the  Securities  Act,  the
Exchange Act, any state  securities  law or any rule or  regulation  promulgated
under the  Securities  Act,  the  Exchange  Act or any state  securities  law in
connection  with the offering  covered by the  Registration  Statement;  and the
Company will reimburse each such Investor,  trustee, partner, officer, director,
agent,  underwriter  or  controlling  person  for any  legal or  other  expenses
reasonably  incurred by them in connection with  investigating  or defending any
such loss,  claim,  damage,  liability or action;  provided,  however,  that the
indemnity  agreement contained in this Section 8 shall not apply to amounts paid
in  settlement  of any such loss,  claim,  damage,  liability  or action if such
settlement is effected  without the consent of the Company  (which consent shall
not be unreasonably withheld),  nor shall the Company be liable in any such case
for any such loss,  claim,  damage,  liability  or action to the extent  that it
arises out of or is based upon a Violation  which occurs in reliance upon and in
conformity  with  written  information  furnished  to it  expressly  for  use in
connection with such  registration by an Investor,  trustee,  partner,  officer,
director, agent, underwriter or controlling person of an Investor.

(b) to the extent  permitted by law,  each  Investor and MJK will  indemnify and
hold harmless the Company,  each of its  directors,  each of its officers,  each
person,  if any, who controls the Company  within the meaning of the  Securities
Act,  any  underwriter  and any  other  Investor  selling  securities  under the
Registration  Statement  or any of such other  Investor's,  trustees,  partners,
directors  or officers or any person who  controls  such  Investor,  against any
losses,  claims,  damages or liabilities (joint or several) to which the Company
or any such director,  officer,  controlling  person,  underwriter or other such
Investor, or trustee, partner,  director,  officer or controlling person of such
other Investor may become subject under the Securities  Act, the Exchange Act or
other  federal  or  state  law,  insofar  as such  losses,  claims,  damages  or
liabilities  (or actions in respect  thereto) arise out of or are based upon any
Violation,  in each  case to the  extent  (and  only to the  extent)  that  such
Violation  occurs in reliance  upon and in conformity  with written  information
furnished by such Investor and stated to be  specifically  for use in connection
with such registration; and each such Investor will reimburse any legal or other
expenses  reasonably  incurred  by the  Company or any such  director,  officer,
controlling person, underwriter or other Investor, or trustee, partner, officer,



director  or  controlling  person of such  other  Investor  in  connection  with
investigating or defending any such loss, claim, damage,  liability or action if
it is judicially determined that there was such a Violation;  provided, however,
that the  indemnity  agreement  contained  in this  Section 8 shall not apply to
amounts paid in settlement of any such loss, claim, damage,  liability or action
if such  settlement  is effected  without the consent of the  Investor  and MJK,
which consent shall not be unreasonably  withheld;  provided further, that in no
event shall any  indemnity  under this Section 8 exceed the gross  proceeds from
the offering received by such Investor or MJK unless the Violation is the result
of fraud on the part of such Investor or MJK.

(c) promptly after receipt by an indemnified  party under this Section of notice
of the  commencement of any action  (including any  governmental  action),  such
indemnified party shall, if a claim in respect thereof is to be made against any
indemnifying  party  under this  Section,  deliver to the  indemnifying  party a
written notice of the commencement thereof and the indemnifying party shall have
the right to  participate  in,  and,  to the  extent the  indemnifying  party so
desires,  jointly with any other indemnifying party similarly noticed, to assume
the defense thereof with counsel mutually satisfactory to the parties; provided,
however,  that an  indemnified  party  shall  have the right to  retain  its own
counsel,  with the fees and expenses to be paid by the  indemnifying  party; and
provided  further,  that if  there  is more  than  one  indemnified  party,  the
indemnifying  party  shall pay for the fees and  expenses of one counsel for any
and all  indemnified  parties to be  mutually  agreed  upon by such  indemnified
parties,  unless  representation of an indemnified party by the counsel retained
by the  other  indemnified  parties  would be  inappropriate  due to  actual  or
potential differing interests between such indemnified  parties.  The failure to
deliver written notice to the indemnifying party within a reasonable time of the
commencement  of any such action,  if materially  prejudicial  to its ability to
defend such action,  shall relieve such  indemnifying  party of any liability to
the indemnified party under this Section, but the omission so to deliver written
notice to the  indemnifying  party will not relieve it of any liability  that it
may have to any indemnified party otherwise than under this Section.

(d) if the  indemnification  provided  for in this Section is held by a court of
competent jurisdiction to be unavailable to an indemnified party with respect to
any losses,  claims, damages or liabilities referred to herein, the indemnifying
party, in lieu of indemnifying such indemnified  party thereunder,  shall to the
extent permitted by applicable law,  contribute to the amount paid or payable by
such indemnified party as a result of such loss,  claim,  damage or liability in
such  proportion  as is  appropriate  to  reflect  the  relative  fault  of  the
indemnifying  party on the one hand and of the indemnified party on the other in
connection with the Violation(s)  that resulted in such loss,  claim,  damage or
liability, as well as any other relevant equitable considerations.  The relative
fault of the indemnifying party and of the indemnified party shall be determined
by  reference  to,  among other  things,  whether  the untrue or alleged  untrue
statement  of a material  fact or the  omission  or alleged  omission to state a
material fact relates to information  supplied by the  indemnifying  party or by
the indemnified  party and the parties'  relative intent,  knowledge,  access to
information and opportunity to correct or prevent such statement or omission. No
person or entity guilty of fraudulent  misrepresentation  (within the meaning of



Section 11 of the  Securities  Act) shall be entitled to  contribution  from any
person  or  entity   who  shall  not  have  been   guilty  of  such   fraudulent
misrepresentation.

(e)      the obligation of the Company, the Investors and MJK under this Section
         shall  survive the  completion  of any offering for resale of shares of
         the Registrable Stock in the Registration Statement, and otherwise.

9. Limitation on Subsequent Registration Rights. From and after the date of this
Agreement, the Company shall not, without the prior written consent of Investors
holding a majority of the  Registrable  Stock,  enter into any agreement,  which
might cause a reduction in the number of shares  includable  by the Investors in
any registration pursuant to Section 2 above.

10.  Successors  and Assigns.  The terms and  conditions of this  Agreement will
inure to the benefit of and be binding upon and be enforceable by the respective
heirs, successors and assigns of the parties hereto; provided, however, that the
rights of an Investor hereunder may be assigned only (a) to a partner or retired
partner of the assigning Investor,  if such assigning Investor is a partnership,
(b) to any Affiliate of the assigning Investor,  (c) to any family member of, or
any trust for the benefit of a family  member of the  assigning  Investor or (d)
concurrent  with the sale or transfer to such assignee of at least 50,000 shares
of Registrable Stock (subject to adjustment for any stock dividend, stock split,
subdivision,  combination or other recapitalization of the Company) then held by
the  assigning  Investor;  provided,  however,  that the  Company  is,  within a
reasonable  time after such transfer,  furnished with written notice of the name
and  address  of the  assignee  and the  securities  with  respect to which such
registration  rights are being assigned and such transferee agrees in writing to
be bound by and  subject  to the terms and  conditions  of this  Agreement.  Any
Investor or MJK making an assignment in connection  with the sale or transfer of
only a portion of its shares will retain its rights under this Agreement for the
shares not sold or transferred.  Nothing in this Agreement,  express or implied,
is  intended to confer  upon any party,  other than the parties  hereto or their
permitted  successors  and  assigns,  any  rights,   remedies,   obligations  or
liabilities under or by reason of this Agreement,  except as expressly  provided
in this Agreement.  Notwithstanding  any provision  contained  elsewhere in this
Agreement,  upon the transfer of shares by any of the parties hereto,  no claims
or causes of action arising out of or related to this  Agreement  existing as of
the  transfer  date will be  transferred  by such party to any heir,  successor,
assign or permitted transferee, provided that the transfer of shares will not be
deemed a waiver by the transferring party of any such claim or cause of action.

11.      Miscellaneous.

(a)      The Company shall not hereafter  enter into any agreement  with respect
         to its securities that is  inconsistent  with the rights granted to the
         Investors in this Agreement.

(b)      Except as otherwise  provided herein,  the provisions of this Agreement
         may not be amended,  modified or supplemented,  and waivers or consents
         to or departures  from the  provisions  hereof may not be given or made
         unless the Company has  obtained the written  consent of the  Investors
         and MJK holding at least a majority of the Registrable Stock.


(c)      All  notices  and  other  communications   provided  for  or  permitted
         hereunder shall be made by hand delivery,  telex, facsimile,  overnight
         courier or registered first-class mail:

           (i)      if to an Investor, at the address set forth on Schedule A
                    attached hereto;

           (ii)     if to MJK, at the address set forth in the Stock Purchase
                    Agreement.

           (iii)    if to the Company, at the address set forth in the Purchase
                    Agreement.

         All such notices and  communications  shall be deemed to have been duly
         given: when delivered,  if by hand, overnight courier or mail; when the
         appropriate answer back is received,  if by telex; when transmission is
         confirmed by the sending unit, if by facsimile.

(d)      This Agreement may be executed in any number of counterparts and by the
         parties hereto in separate counterparts, each of which when so executed
         shall be deemed to be an original and all of which taken together shall
         constitute one an the same agreement.

(e)      The headings to this  Agreement are for  convenience  of reference only
         and shall not limit or otherwise affect the meaning hereof.

(f) This  Agreement  shall be governed by and construed in  accordance  with the
laws of the State of Minnesota without giving effect to the principles of choice
or conflict of law thereof.  Each of the Company and the  Investors  irrevocably
consent to the exclusive  jurisdiction  of the United States  Federal courts and
state courts, located in Hennepin County,  Minnesota,  in any suit or proceeding
relating to, based on or arising under this Agreement and irrevocably agree that
all claims in  respect  of such suit or  proceeding  may be  determined  in such
courts.  The Company  irrevocably waives the defense of an inconvenient forum to
the  maintenance of such suit or  proceeding.  Service of process on the Company
mailed by first class mail shall be deemed in every respect effective service of
process upon the Company in any such suit or  proceeding.  Nothing  herein shall
affect the right of any  Investor to serve  process in any manner  permitted  by
law.

(g)      In the event that any one or more of the provisions  contained  herein,
         or the  application  thereof  in any  circumstances,  is held  invalid,
         illegal or unenforceable  in any respect for any reason,  the validity,
         legality and  enforceability  of such  provision in every other respect
         and of the remaining  provisions  contained  herein shall not be in any
         way  impaired  thereby,  it being  intended  that all of the rights and
         privileges of the Investors and the Company shall be enforceable to the
         fullest extent permitted by law.

(h)      The remedies  provided for in this Agreement shall be cumulative and in
         addition  to all other  remedies  available,  at law or in equity,  and



         nothing  herein shall limit a holder's  right to pursue actual  damages
         for any  failure  by the  Company  to  comply  with  the  terms of this
         Agreement.

(i)      This  Agreement,  the  documents  referenced  herein  and the  exhibits
         thereto,  constitute  the entire  understanding  and  agreement  of the
         parties  hereto with respect to the subject  matter  hereof and thereof
         and   supersede   all   prior   and   contemporaneous   agreements   or
         understandings,  inducements or conditions, express or implied, written
         or oral,  between the parties  with  respect  hereto and  thereto.  The
         express terms hereof control and supersede any course of performance or
         usage of the trade inconsistent with any of the terms hereof.


         IN WITNESS WHEREOF,  the parties have executed this Registration Rights
Agreement as of the date first written above.


                              COMPANY:

                              MEDTOX SCIENTIFIC, INC.



                              By:
                                  ---------------------------------------------
                                   Name:
                                   Title:


                              MILLER, JOHNSON & KUEHN, INC.



                              By:
                                  ---------------------------------------------
                                   Name:
                                   Title: