EXHIBIT  99.21
- --------------


                                                                       CDEX INC.
                                              THE TECHNOLOGY DEVELOPMENT COMPANY
August  27,  2002

Mr.  Frank  Arnold
Outside  Council  for
Loch  Harris,  Inc.
1807  West  Slaughter  Lane  #200-506
Austin,  Texas  78748

                  RE:  ACTIONS  WITH  RESPECT  TO  CDEX  SHARES

Dear  Mr.  Arnold:

     I  am writing in response to the actions recently taken by Loch Harris with
respect  to  the 48,000,000 shares of CDEX common stock that were issued to Loch
Harris  pursuant  to the Asset Purchase Agreement, dated August 4, 2001, between
CDEX  and  Loch  Harris,  to  make  clear  CDEX's position with respect to those
actions.

     You  recently  faxed  to  my attention a draft trust agreement developed by
other  attorneys,  pursuant  to which those shares of CDEX common stock would be
transferred  to  a  trust,  for  eventual  distribution  to  the  Loch  Harris
stockholders.  While  we  had  not researched the issue, we were not opposed, in
principle,  to the idea of using a trust or some similar mechanism to assure the
safekeeping  of  those  shares  of  CDEX  common  stock,  pending  their  legal
distribution  to  the Loch Harris shareholders. However, from our discussions we
both  agreed  that  the  draft  trust  agreement  had  serious deficiencies that
required  remedying.  For  example, the draft trust agreement stated that voting
rights  with  respect  to  the  shares  of  CDEX common stock would shift to the
trustees upon transfer of shares to the trust. This would be in direct violation
of  the  Asset  Purchase Agreement, which states that the voting rights of those
shares  are to remain with the CDEX Board of Directors until distribution to the
Loch  Harris  shareholders  or  until it is determined that such distribution is
"legally  impossible  or  economically  impractical."  Under  the Asset Purchase
Agreement,  even  after such a determination is made, voting rights with respect
to  the  shares  of  CDEX  common  stock  are  to  remain with the CDEX Board of
Directors  until  the  shares  are  "transferred  or  assigned  to  parties  not
controlled  in any fashion by Loch or its Officers or Directors." With these and
other  deficiencies  in mind, we asked our attorneys to prepare, on an expedited
basis,  a  revised  draft  trust  agreement, a copy of which was sent to you via
e-mail  on  August  20,  2002.

     After  expediting delivery of the draft trust agreement to you, in parallel
we  also  had  our  attorneys  look  at  the  securities  law  implications  of
transferring  the  shares  of  CDEX  common  stock  to  a  trust  in  the manner
contemplated  by Loch Harris. After such review, we were advised that a transfer
of  the  shares of CDEX common stock to a trust in such a manner would appear to
constitute  an  unregistered  transfer  of  such shares, in violation of federal
securities laws. We promptly called you to inform you of those concerns, leaving
voice  mail  messages  starting  Thursday, August 22, and finally discussing the
concerns  with you on Monday, August 26. We are formally documenting our actions
in  this  letter.



     Obviously, if utilizing such an approach would violate applicable law, CDEX
is  opposed  to it. Please keep in mind that CDEX is entitled to refuse transfer
of  record ownership of shares of CDEX stock when such transfer would be legally
flawed,  such  as  in violation of applicable securities laws. For example, CDEX
would refuse any transfer of record ownership of those 48,000,000 shares of CDEX
common  stock  other than in strict conformity with the Asset Purchase Agreement
(which  has  the  expressed intent of distribution of those shares on a pro-rata
basis  to  Loch  Harris  shareholders)  and  applicable  laws  and  regulations.
Accordingly,  we  request  that  you disregard the draft trust agreement that we
sent  to  you  and  closely  examine  this  issue  from a federal securities law
perspective.  If,  after  such  review,  Loch Harris determines that there is no
legal  impediment  to  utilizing the trust approach and provides a written Legal
Opinion  from  qualified  securities  counsel to that affect, CDEX will consider
such  opinion  in  fulfilling  our  obligations  in  relation to the transfer of
ownership  rights.

     While  we  have  already  alerted you to the content of this letter, we are
sending  this  letter by express mail with an expedited copy provided by e-mail.
Further,  we  are  willing  to  provide  reasonable  assistance  in  creating  a
satisfactory  result for all the parties, within the bounds of strict compliance
with  applicable  law. Please do not hesitate to contact me at CDEX's offices to
further  discuss  these  matters.


                              Sincerely,


                              Malcolm  H.  Phillips,  Jr.
                              President  and  Chief  Executive  Officer



               1700 Rockville Pike, Suite 400, Rockville, MD 20852
                                www.cdex-inc.com
                                ----------------