EXHIBIT 10.41

         AGREEMENT  dated as of March 17, 1997 between Harry G. McCoy  ("McCoy")
and EDITEK, Inc.

     WHEREAS,  EDITEK,  is the  owner of all the  outstanding  shares  of MedTox
Laboratories, Inc., including the name of "MedTox"; and

         WHEREAS,  upon  EDITEK's  acquisition  of MedTox  Laboratories,  Inc.'s
assets, McCoy reserved rights to the name "MedTox" in certain events; and

         WHEREAS,  McCoy is the Chairman  and  President of EDITEK and wishes to
assign all of his rights in the name of "MedTox" to EDITEK.

         NOW THEREFORE,  in  consideration  of the premises,  the parties hereby
agree that McCoy hereby unconditionally assigns to EDITEK whatever rights he has
to the name "MedTox." In furtherance of such  assignment the Agreement  dated as
of January 30, 1995,  pursuant to which EDITEK  assigned to McCoy certain rights
to the name "MedTox", is hereby terminated.

         IN WITNESS WHEREOF, the parties executed and delivered this Agreement.


                                           EDITEK, INC.


______________________________              By: ______________________________
Harry G. McCoy                                  Chief Executive Officer