Exhibit 10.4

                             EMPLOYMENT AGREEMENT

     THIS EMPLOYMENT AGREEMENT (this "Agreement"), made and entered into this
1st day of May, 1998, by and between Laboratory Specialists, Inc. (the
"Company"), a Louisiana corporation, Laboratory Specialists of America, Inc., an
Oklahoma corporation and parent of the Company ("LSAI") and Roy D. Harrison, an
individual ("Harrison").

     WHEREAS, the parties hereto entered into this Employment Agreement in
connection with and as a condition of that certain Asset Purchase Agreement
between Harrison Laboratories, Inc. ("HLI"), Harrison, the Company and LSAI,
dated April 13, 1998 (the "Asset Purchase Agreement"), providing for the
purchase of certain assets of HLI by the Company and LSAI;

     NOW, THEREFORE, for and in consideration of the conditions hereinbelow to
be performed on the part of the respective parties hereto, and in consideration
of the mutuality thereof, the parties hereto agree as follows:

     1.   Term of Employment.  The Company hereby agrees to employ Harrison, and
Harrison hereby agrees to serve the Company as a sales representative, during
the three-year period commencing on the date of this Agreement, subject to the
provisions of Sections 4 and 5 hereof.

     2.   Duties.  Substantially all of the duties and responsibilities of
Harrison, subject to such travel as the duties of Harrison hereunder may
reasonably require, shall be performed by Harrison at and from Midland, Texas.
During the term of employment hereunder, Harrison shall devote his full business
time, attention, skill, energy and best efforts to the duties assigned to him
from time to time by the Company as a sale representative to service and
maintain the customer base acquired by LSAI and the Company from HLI pursuant to
the Asset Purchase Agreement and to further develop the customer base of the
Company for the services offered and provided by the Company within the
marketing area assigned to Harrison by the Company.  As an employee of the
Company, Harrison shall be subject to the overall supervision and instructions
of management  of the Company.

     3.   Compensation and Other Benefits. During Harrison's employment pursuant
to this Agreement, the Company or LSAI shall pay or provide to Harrison and
Harrison shall be entitled to receive or have maintained for his benefit, the
following:

          3.1 The Company or LSAI shall compensate Harrison for the services to
     be rendered by him hereunder as follows:

              3.1.1  The Company or LSAI shall pay to Harrison an annual base
          salary in the sum of Fifty Thousand ($50,000) per year, payable in
          equal semi-monthly, pay-period installments on the first and fifteen
          day of each month following the date of this Agreement; provided,
          however, that the first and last semi-monthly pay-period installments
          to be paid during the term of Harrison's employment pursuant to this
          Agreement shall be pro rated based on the number of days of such
          employment during the applicable semi-monthly, pay-period installment.

              3.1.2  The Company or LSAI shall pay to Harrison a monthly bonus
          equal to three and one-half percent (3.5%) of HLI Revenues (as defined
          below) during each month payable on the fifteenth day of the following
          month.  For purposes of this Agreement, "HLI Revenues" shall mean all
          revenues of the Company directly attributable to the customers
          comprising the customer based of HLI acquired by LSAI and the Company
          pursuant to the Asset Purchase Agreement as determined in accordance
          with generally accepted accounting principles.

              3.1.3  With respect to New Customers (as defined below) obtained
          by Harrison for the Forensic Testing services provided by the Company
          and LSAI, Harrison shall be entitled to monthly sales commissions as
          set forth in this Section 3.1.3.  The Company or LSAI shall pay to
          Harrison a monthly commission, payable on the fifteenth day of each
          month, based upon the revenues for Forensic Testing provided to each
          New Customer during the preceding month, as determined in accordance
          with generally 

 
          accepted account principles, equal to (i) six percent (6%) of such
          revenues during the first year that each New Customer utilizes the
          Forensic Testing services of the Company, (ii) four percent (4%) of
          such revenues during the second year that each New Customer utilizes
          the Forensic Testing services of the Company, (iii) two percent (2%)
          of such revenues during the third year that such New Customer utilizes
          the Forensic Testing services of the Company, and (iv) one percent
          (1%) after the third year that such New Customer utilizes the Forensic
          Testing services of the Company and LSAI. For purposes of this
          Agreement, "New Customers" shall mean customers of the Company and
          LSAI other than those customers that have previously utilized the
          Forensic Testing services of the Company and LSAI on the date of this
          Agreement, the customers comprising in part the assets purchase by
          LSAI and the Company from HLI pursuant to the Asset Purchase
          Agreement, and those customers comprising in whole or in part the
          assets of a company subsequently acquired directly or indirectly by
          LSAI or the Company pursuant to a purchase or merger transaction.

          3.2  Harrison is hereby authorized to incur reasonable expenses for
     the promotion of the Company's business, including entertainment, travel
     and similar expenses (including without limitation oil and gas expenses of
     the automobile utilized by Harrison), and he shall be reimbursed therefore
     by the Company or LSAI upon his presentation of itemized accounts of such
     expenditures.

          3.3  The Company or LSAI shall provide to Harrison health and
     disability insurance benefits comparable to those provided to an executive
     of the Company.

          3.4  Harrison shall be entitled to reasonable periods of vacation with
     pay in each year, and reasonable periods of sick leave with pay in
     accordance with Company's vacation and sick leave policies applicable to an
     executive of the Company as established by the Board of Directors of the
     Company.

          3.5  The Company or LSAI shall pay to Harrison an automobile allowance
     of Five Hundred Dollars ($500) per month, payable on the fifteen day of
     each month while employed pursuant to this Agreement to assist Harrison in
     the performance of his duties and responsibilities as an employee of the
     Company.

          3.6  On the date of this Agreement, Harrison shall be entitled to
     become a participant in the 401(k) retirement benefit plan maintained by
     the Company for its employees on the same basis that other Company
     employees participate.  The Company agrees to waive any minimum service
     requirement for initial participation and vesting under such benefit plan.

     4.   Disability or Death.

          4.1  In the event the Board of Directors of the Company determines in
     good faith that Harrison is unable, because of physical or mental illness
     or disability, to render services of the character contemplated by this
     Agreement and that such illness or disability reasonably may be expected to
     be permanent or to continue for a period of at least six (6) consecutive
     months (or for shorter periods totaling more than six (6) months during any
     period of eighteen (18) consecutive months), in such event the Board of
     Directors of the Company may elect to terminate the employment of Harrison
     hereunder upon written notice by the Company to Harrison effective on the
     next first or fifteenth day of the month following the date of such notice.
     Prior to and as a condition precedent of any such termination by the Board
     of Directors, upon request therefor by the Company, Harrison shall submit
     to a medical examination by a physician designated by the Company in
     Midland, Texas, for the purpose of determining the existence, nature and
     extent of any such illness or disability; provided, however, that in the
     event Harrison refuses or fails to submit himself to such medical
     examination within 30 days of such request, the Board of Directors shall
     have the right immediately to terminate Harrison's employment pursuant to
     this Agreement without such medical examination.  In the event the
     physician designated by the Company determines that Harrison is unable,
     because of physical or mental illness or disability, to render services of
     the character contemplated this Agreement, Harrison shall have the right,
     within 10 days of the determination of Harrison's illness or disability by
     the physician selected by the Company, to select a physician in Midland,
     Texas, and submit himself to an examination for the purpose of determining
     the existence, nature and extent any such illness or disability.  In the
     event Harrison fails to submit himself for examination by the physician
     selected by Harrison within the 10-day period, the determination of such
     illness or disability the by physician selected by the Company shall be
     binding 

 
     upon Harrison and shall be reasonable grounds for the Company to terminate
     Harrison's employment pursuant to this Agreement. Furthermore, in the event
     the physician designated by the Company and the physician selected by
     Harrison are unable to reach an agreement on the issue of the ability of
     Harrison to perform services under this Agreement due to any illness or
     disability, such physicians shall promptly designate a qualified physician
     to make such determination and the finding of such physician as to the
     existence or nonexistence of such illness or disability shall be binding on
     the Company and Harrison and, if such illness or disability is found to
     exist, such finding shall be reasonable grounds for the Company to
     terminate Harrison's employment pursuant to this Agreement. In the event
     the Board of Directors terminates the employment of Harrison under this
     Agreement pursuant to this Section 4.1, Harrison shall be entitled to
     receive the amount of compensation determined pursuant to (i) Sections
     3.1.1 and 3.1.3 up to the date of the termination of the employment of
     Harrison, payable on the dates established pursuant to Sections 3.1.1 and
     3.1.3, respectively, and (ii) Section 3.1.2 from the date of Harrison's
     employment termination pursuant to this Section 4.1 through April 30, 2001,
     payable on the fifteenth day of each month following the end of each month
     during such period.

          4.2  In the event Harrison shall die during the term of this
     Agreement, this Agreement shall terminate effective on the next first or
     fifteenth day of the month following the date of death, and the Company or
     LSAI shall pay to the spouse of Harrison, or if unmarried at the time of
     his death, to the estate of Harrison, the compensation otherwise payable to
     Harrison but for his death pursuant to (i) Sections 3.1.1 and 3.1.2  for a
     period of three (3) months following the date of Harrison's death, payable
     on the dates established pursuant to Sections 3.1.1 and 3.1.3,
     respectively, and (ii) Section 3.1.2 from the date of Harrison's death
     through April 30, 2001, payable on the fifteenth day of each month
     following the end of each month during such period. '''

     5.   Termination for Cause.  In the event the Board of Directors of the
Company determines in good faith that Harrison should be terminated for Cause
(as defined below), the Company may terminate this Agreement, and all
obligations hereunder shall thereupon terminate.  For purposes of this
Agreement, "Cause" shall mean (i) gross negligence by Harrison, (ii) the willful
failure by Harrison to substantially perform the duties assigned to Harrison
under this Agreement (other than physical or mental illness or disability which
determination shall be in accordance with Section 4.1 of this Agreement), (iii)
fraud, including without limitation any misrepresentation or breach of any
warranty or covenant by HLI contained in the Asset Purchase Agreement, or (iv)
the willful misconduct by Harrison which is materially injurious to the Company
or LSAI, or (v) Harrison's conviction of a felony.

     6.   Non-Competition.  (i) During Harrison's employment pursuant to this
Agreement, or, if longer, the period of employment of Harrison by the Company or
LSAI, Harrison shall not engage in competition with the Company or LSAI, either
directly or indirectly, in any manner or capacity as an employee or executive
officer of a competitor company in any phase of the business carried on by the
Company or LSAI at any time during the term of Agreement. Furthermore, in order
to induce LSAI and the Company to enter into the Asset Purchase Agreement and
this Agreement, Harrison covenants and agrees, for a period of three (3) years
following the date of Harrison's termination of employment with the Company, not
to (A) directly or indirectly solicit, canvass or otherwise contact or accept
any business or transaction from any customer, former or otherwise of the
Company, or take any action which shall cause the termination or curtailment of
the business relationship with LSAI or the Company and/or its successor or
successors and any of its customers, former or otherwise, including without
limitation those customers constituting in whole or in part the HLI Assets and
(B) directly or indirectly, without the prior written consent of LSAI and the
Company or their successor or successors, solicit, entice, raid, persuade or
induce any individual who as of the date of Harrison's employment termination is
an employee of LSAI or the Company, or any of its successor or successors, to
terminate or refrain from renewing or extending his or her employment with LSAI
or the Company or any of its respective successors, except this clause shall not
apply to any such employee whose employment shall have been terminated by LSAI
or the Company or its successor or successors.

     (ii)   If any part of the restrictions set forth in subsection (i) of this
Section 6 shall, for any reason whatsoever, be declared invalid by an
arbitration panel, the validity or enforceability of the remainder of such
restrictions shall not thereby be adversely affected and shall be enforced to
the fullest extent permitted by law.  If any of such restrictions are deemed to
be unreasonable by an arbitration panel, then Harrison shall submit to the
reduction or modification of this Section 6 as said panel deems reasonable.

 
     (iii)  If Harrison shall be in violation of the aforementioned restrictive
covenant and agreements in this Section 6, then in addition to other remedies
available to LSAI or the Company, the time limitation thereof shall be extended
for a period of time equal to the period of time during which such violation
occurred.

     (iv)   The terms and provisions of this Section 6 are for the benefit of
LSAI and the Company and may be waived in whole or in part only in writing by
LSAI and the Company.

     7.   Confidentiality.  During Harrison's employment pursuant to this
Agreement, or, if longer, the period of employment of Harrison by the Company,
and for a period of three (3) years thereafter, Harrison shall not divulge to
anyone, other than the Company, LSAI or persons designated by the Company or
LSAI in writing, any confidential material information directly or indirectly
useful in any aspect of the business of the Company, LSAI or any of its
subsidiaries, as conducted from time to time, as to which Harrison is now, or at
any time during employment shall become, informed and which is not then
generally known to the public or recognized as standard practice.

     8.   Certain Provisions to Survive Termination; Etc.  Notwithstanding any
termination of his employment under this Agreement, Harrison, in consideration
of his employment hereunder to the date of such termination, shall remain bound
by the provisions of Section 6 and 7, and consequently, in addition to all other
remedies that may be available to it, the Company shall be entitled to
injunctive relief for any actual or threatened violation of such Sections.
Harrison acknowledges that the Company, LSAI and its successor or successors
would be irreparable damaged and that money damages and any other remedy
available at law would be inadequate to redress or remedy any loss in the event
that the provisions of Sections 6 and 7 were not fully performed in accordance
with their specific terms or are otherwise breached, and Harrison, therefore,
agrees that the Company, LSAI and its successor or successors, in addition to
recovering any claim for  damages or obtaining any other remedy available at
law, also may enforce the terms of Sections 6 and 7 by injunction or specific
performance and may obtain may other appropriate remedy available in equity, and
that Harrison hereby waives his right to assert and will not assert in defense
against such equitable claims that an adequate legal remedy is available.

     9.   Non-Assignability. Neither party hereto shall have the right to assign
this Agreement or any rights or obligations hereunder without the written
consent of the other party.

     10.  Arbitration.  Any controversy or claim arising out of or relating to
this Agreement, or the breach thereof, shall be settled by arbitration in
accordance with the Rules of the American Arbitration Association and judgment
upon the award rendered by the arbitrator or arbitrators may be entered in any
court having jurisdiction thereof.  The arbitration proceedings shall be
conducted in Midland, Texas, unless otherwise agreed by the parties hereto.  The
arbitrator or arbitrators shall be deemed to possess the powers to issue
mandatory orders and restraining orders in connection with such arbitration;
provided, however, that nothing in this Section 10 shall be construed so as to
deny the Company, LSAI and its successor or successors the right and power to
seek and obtain injunctive relief in a court of equity for any breach or
threatened breach by Harrison of any of his covenants contained in Sections 6
and 7 hereof.

     11.  Notice.  All notices required or permitted to be given hereunder shall
be in writing and shall be deemed to have been given forty-eight (48) hours
after depositing in the United States mail, certified mail, postage prepaid,
addressed to the party to receive such notice at the address set forth
hereinbelow or such other address as either party may give to the other in
writing pursuant to written notice pursuant to this Section:

          If to Harrison:     Mr. Roy D. Harrison
                              5301 Shady Bend Court
                              Midland, Texas 79707

          If to the Company:  Laboratory Specialists, Inc.
                              1111 Newton Street
                              Gretna, Louisiana 70053
                              Attention: Larry E. Howell

          If to LSAI:         Laboratory Specialists of America, Inc.
                              101 Park Avenue, Suite 810
                              Oklahoma City, Oklahoma 73102

 
                              Attention: John Simonelli

     12.  General.  The terms and provisions herein contained (i) constitute the
entire Agreement between the Company, LSAI and Harrison with respect to the
subject matter hereof, (ii) may be amended or modified only by a written
instrument executed by the parties hereto, and (iii) shall be construed and
enforced in accordance with the laws in effect in the State of Texas without
regard to its conflicts of law provisions.  Failure by a party hereto to require
performance of any provision of this Agreement shall not affect, impair or waive
such party's right to require full performance at any time thereafter.

     This Agreement may be executed in two or more counterparts, each of which
shall be deemed an original but all of which together shall constitute one and
the same instrument.

     IN WITNESS WHEREOF, the parties hereto have duly executed this Agreement on
the date first above written.

"Company"                     LABORATORY SPECIALISTS, INC.


                              By: /s/ Arthur R. Peterson, Jr.
                                  -----------------------------------
                                  Arthur R. Peterson, Jr., President


"LSAI"                        LABORATORY SPECIALISTS OF AMERICA, INC.


                              By: /s/ Larry E. Howell
                                  -----------------------------------
                                  Larry E. Howell, President


"Harrison"                        /s/ Roy D, Harrison
                                  -----------------------------------
                                  Roy D. Harrison