EXHIBIT 6.20

                                 BIOFIELD CORP.
                             SHARE OPTION AGREEMENT


                                         Date of Grant:  As of ________________
                                         No. of Shares:  _______________________

         1.    Grant of Option. Biofield Corp., a Delaware corporation (the
"Company"), hereby grants to John D. Stephens (the "Optionee"), the following
option (the "Option") to purchase, upon the terms and conditions hereinafter set
forth and, unless otherwise indicated herein, in the Company's 1992 Employee
Stock Option Incentive Plan (the "Plan"), an aggregate of shares (subject to
adjustment as hereinafter provided) of the Company's common stock, par value
$.001 per share (the "Stock") at an exercise price equal to $____ per share (the
"Exercise Price"). It is understood that the Option is not intended to
constitute an incentive stock option as that term is defined in Section 422A of
the Internal Revenue Code of 1986.

         2.    Exercise Period. The Optionee may exercise the Option at any time
until its expiration.

         The Option may be exercised by the Optionee for any number of shares up
to the total number of shares as to which the Option has become exercisable,
less the number of shares as to which the Option has previously been exercised,
from time to time and at any time until the termination or expiration of the
Option.

         Unless earlier terminated as provided herein and in the Plan, the
Option shall expire and terminate on _________________.

         3.    Procedure for Exercise. The Optionee may exercise the Option in
whole or in part, but not as to any fractional shares, by surrender of the
Option, properly endorsed if required, at the principal office of the Company,
and by delivering by certified check or bank check the aggregate Exercise Price
for the number of shares to be purchased pursuant to such exercise. At the time
of exercise, the Optionee shall deliver a letter to the Company agreeing that
the Optionee is purchasing the Stock for investment purposes and not with a view
to distribution otherwise then in compliance with the Securities Act of 1933
(the "Securities Act"), and agreeing not to offer to sell, sell or otherwise
dispose of any of such shares of Stock acquired by the Optionee pursuant to the
Option in violation of the Securities Act or any applicable state securities
laws. The Stock purchased shall be deemed to be issued to the Optionee on and as
of the date on which the Option is surrendered and payment is made for the
Stock. Certificates representing the Stock purchased shall be delivered to the
Optionee promptly, which usually is within ten days after the rights represented
by the Option have been properly exercised. Unless the Option shall have expired

<PAGE>

or shall have been fully exercised, a new Share Option Agreement in the same
form as this Share Option Agreement representing any number of shares for which
the Option shall not have been exercised, shall also be delivered to the
Optionee within that time.

         4.    Shares to be Fully Paid; Reservation. The Company covenants and
agrees that when issued and paid for in accordance with the terms of this Share
Option Agreement, the shares of common stock underlying the Option shall, on
issuance, be fully paid and nonassessable and free from all taxes, liens and
charges related to the issuance of the shares. The Company further covenants and
agrees that during the period within which the rights represented by the Option
may be exercised, the Company shall, at all times, have authorized and reserved
for the purpose of issuance or transfer on exercise of the Option a sufficient
number of shares subject to the Option to provide for its exercise.

         5.    Adjustment of Number of Option Shares. The number of shares
purchasable upon the exercise of the Option shall be subject to adjustment if
the Company shall (i) pay a dividend in shares of Stock or make a distribution
in shares of Stock, (ii) subdivide (by means of stock split or otherwise) its
outstanding shares of Stock, (iii) combine or reduce (by means of reverse stock
split or otherwise) its outstanding shares of Stock, or (iv) issue by
reclassification of its shares of Stock other securities of the Company. The
Exercise Price and number of shares issuable upon exercise of the Option
immediately prior thereto shall be proportionately adjusted so that the Optionee
shall be entitled to receive upon payment of the aggregate Exercise Price the
number of shares of the Company which the Optionee would have owned or would
have been entitled to receive, after the happening of any of the events
described above, had the Option been exercised immediately prior to the
happening of any of the events described or any record date with respect
thereto. Any adjustment made pursuant to this paragraph shall become effective
immediately after the effective date of such event retroactive to the record
date, if any, for such event.

         6.    Legend. The Optionee consents to the placement of any legend
required by applicable state securities laws and of the following legend on each
certificate representing the Stock.

         "THE SHARES EVIDENCED BY THIS CERTIFICATE HAVE NOT BEEN REGISTERED
     UNDER THE SECURITIES ACT OF 1933 AND MAY NOT BE SOLD, TRANSFERRED,
     EXCHANGED OR OTHERWISE DISPOSED OF UNLESS A REGISTRATION STATEMENT UNDER
     SUCH ACT IS THEN IN EFFECT WITH RESPECT THEREOF OR AN OPINION OF COUNSEL
     ACCEPTABLE TO THE ISSUER HAS BEEN OBTAINED TO THE EFFECT THAT NO SUCH
     REGISTRATION IS REQUIRED."

         "THESE SECURITIES HAVE BEEN ISSUED OR SOLD IN RELIANCE ON PARAGRAPH
     (13) OF THE CODE SECTION 10-5-9 OF THE GEORGIA SECURITIES ACT OF 1973 AND
     MAY NOT BE SOLD OR TRANSFERRED EXCEPT IN A TRANSACTION WHICH IS EXEMPT
     UNDER SUCH ACT OR PURSUANT TO AN EFFECTIVE REGISTRATION STATEMENT UNDER
     SUCH ACT."

                                       2
<PAGE>

         7.    Assignment. The Option, without the prior written consent of the
Company, may not be assigned or otherwise transferred other than by will or the
laws of descent and may be exercised during the Optionee's lifetime only by the
Optionee or the Optionee's guardian or legal representative.

         8.    Termination.
               -----------

               (a)    Except as provided in paragraphs 8(b), 8(c) and 8(d)
below, if the Optionee ceases to be employed by the Company for any reason other
than "termination for cause" (as such term is defined in the Company's 1996
Stock Option Plan), the portion of unexercised Option that is exercisable at the
time of such termination of employment may thereafter be exercised during the
three-month period following such termination unless the Option by its terms
expires before such date.

               (b)    If the Optionee dies during the Optionee's employment by
the Company, the portion of unexercised Option that is exercisable at the time
of the Optionee's death may thereafter be exercised during the twelve-month
period following the Optionee's death unless the Option by its terms expires
before such date.

               (c)    If the Optionee ceases to be employed by the Company as a
result of a "permanent and total" disability (as such term is defined in the
Plan) the portion of unexercised Option that is exercisable at the time of the
Optionee's cessation of employment may thereafter be exercised during the
twelve-month period following the date of such cessation of employment unless
the Option by its terms expires before such date.

               (d)    If the Optionee ceases to be employed by the Company as a
result of a "termination for cause" the Option shall expire immediately upon the
event resulting in "termination for cause" and the Optionee shall thereafter
have no further right to purchase any Stock pursuant to the Option.

         9.    No Shareholder Rights. The Optionee shall have no rights as a
shareholder of the Company with respect to shares of Stock covered by the Option
until payment for such shares shall have been made in full and until the date of
issuance of a stock certificate for such shares.

         10.   Miscellaneous.
               -------------

               (a)    This Agreement shall be construed in accordance with, and
governed by, the laws of the State of Delaware (without giving effect to
principals of conflicts of law).

                                       3
<PAGE>

               (b)    This Agreement may only be modified by a writing signed by
each of the parties hereto.

               (c)    All notices hereunder shall be in writing and, if to the
Company, shall be delivered personally to the Secretary of the Company or
mailed, by certified mail, return receipt requested or by guaranteed next
business day delivery service to its principal office, addressed to the
attention of the Secretary, and if to the Optionee, shall be delivered
personally or mailed, by certified mail, return receipt requested or by
guaranteed next business day delivery service to the address noted on the
signature page of this Share Option Agreement. Either party may change its
address for receipt of notices by advising the other party of such change in
writing in accordance with the preceding sentence.

               (d)    This Agreement may be executed in one or more
counterparts, each of which shall be an original, and both of which shall
together constitute one and the same instrument.

               (e)    This Agreement and the Plan sets forth the entire
Agreement between the Company and the Optionee with respect to the subject
matter hereto and supercedes all prior understandings, whether oral or written.
Notwithstanding the immediately prior sentence, "termination for cause" with
respect to the Optionee's employment with the Company shall have the meaning set
forth in Section 5.7 of the Company's 1996 Stock Option Plan.

               (f)    The Optionee acknowledges receipt of the attached copy of
the Company's 1992 Employee Stock Option Incentive Plan, and agrees to be bound
by all of the terms and conditions thereof.

                                       4
<PAGE>

               IN WITNESS WHEREOF, the parties have executed this Share Option
Agreement as of the day _________ of __________________.


                                       BIOFIELD CORP.


                                       By: /s/ JOHN D. STEPHENS
                                           -------------------------------------
                                           John D. Stephens

                                           Address:

                                        5