UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                              Washington, DC 20549

                                  SCHEDULE 13G



                    Under the Securities Exchange Act of 1934

                              (Amendment No. 1 )*
                                             --



                         Bio-Imaging Technologies, Inc.
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                                (Name of Issuer)



                        Common Stock, $0.00025 par value
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                         (Title of Class of Securities)



                                    09056N103
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                                 (CUSIP Number)



                                December 31, 2002
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             (Date of Event Which Requires Filing of this Statement)


Check the appropriate box to designate the rule pursuant to which this Schedule
is filed:

[  ]  Rule 13d-1(b)
[X ]  Rule 13d-1(c)
[  ]  Rule 13d-1(d)

* The remainder of this cover page shall be filled out for a reporting person's
initial filing on this form with respect to the subject class of securities, and
for any subsequent amendment containing information which would alter the
disclosures provided in a prior cover page.

The information required in the remainder of this cover page shall not be deemed
to be "filed" for the purpose of Section 18 of the Securities Exchange Act of
1934 ("Act") or otherwise subject to the liabilities of that section of the Act
but shall be subject to all other provisions of the Act (however, see the
Notes).






CUSIP No.      09056N103
           -------------------------------
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1. Names of Reporting Persons.
   I.R.S. Identification Nos. of above persons (entities only).

              Mark L. Weinstein
           --------------------------------
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2. Check the Appropriate Box if a Member of a Group (See Instructions)

          (a)
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          (b)
             ------------------------------------------------------------------
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3. SEC Use Only
                ---------------------------------------------------------------
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4. Citizenship or Place of Organization        United States
                                         --------------------------------------
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                  5. Sole Voting Power           588,500
   Number of                           ----------------------------------------
   Shares         -------------------------------------------------------------
   Beneficially
   Owned by       6. Shared Voting Power           N/A
   Each                                 ---------------------------------------
   Reporting      -------------------------------------------------------------
   Person With
                  7. Sole Dispositive Power        588,500
                                            -----------------------------------
                  -------------------------------------------------------------
                  8. Shared Dispositive Power          N/A
                                             ----------------------------------
-------------------------------------------------------------------------------

9. Aggregate Amount Beneficially Owned by Each Reporting Person     588,500
                                                               ----------------
-------------------------------------------------------------------------------

10. Check if the Aggregate Amount in Row (9) Excludes Certain Shares
    (See Instructions)
                      ---------------------------------------------------------

11. Percent of Class Represented by Amount in Row (9)          6.6%
                                                     --------------------------
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12. Type of Reporting Person (See Instructions)          IN
                                                -------------------------------

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ITEM 1.

               (a)  Name of Issuer:

                    The issuer of the securities to which this statement relates
                    is Bio-Imaging Technologies, Inc., a Delaware corporation.

               (b)  Address of Issuer's Principal Executive Offices:

                    The issuer's principal  executive offices are located at 826
                    Newtown-Yardley Road, Newtown, Pennsylvania 18940-1721.

 ITEM 2.

               (a)  Name of Person Filing:

                    The filing person is Mark L. Weinstein.

               (b)  Address of Principal Business Office or, if none, Residence:

                    The  principal  business  office  for the  filing  person is
                    Bio-Imaging  Technologies,  Inc., 826 Newtown-Yardley  Road,
                    Newtown, Pennsylvania 18940-1721.

               (c)  Citizenship:

                    The citizenship for the filing person is United States.

               (d)  Title of Class of Securities:

                    The  title  of the  class of  securities  is  common  stock,
                    $0.00025 par value.

               (e)  CUSIP Number:

                    The CUSIP number is 09056N103.

ITEM 3.             IF THIS STATEMENT IS FILED  PURSUANT TO  SS.SS.240.13D-1(B),
                    OR  240.13D-2(B)  OR (C), CHECK WHETHER THE PERSON FILING IS
                    A:

                    Selection    of    a    filing    category    pursuant    to
                    ss.ss.240.13d-1(b),   or   240.13d-2(b)   or   (c)   is  not
                    applicable.

ITEM 4.             OWNERSHIP.

Provide the following  information regarding the aggregate number and percentage
of the class of securities of the issuer identified in Item 1.

               (a)  Amount beneficially owned: The number of shares beneficially
                    owned by Mark L. Weinstein is 588,500.  Such number includes
                    450,000 shares  underlying  options which are exercisable as
                    of December 31, 2002 or sixty (60) days after such date.

               (b)  Percent of class:  The  percent of the class held by Mark L.
                    Weinstein  is 6.6%.

               (c)  Number of shares as to which the person has:

                    (i)  Sole  power  to vote or to  direct  the  vote:  Mark L.
                         Weinstein  has sole power to vote or to direct the vote
                         of 588,500 shares.

                    (ii) Shared power to vote or to direct the vote:  The shared
                         power to vote or to  direct  the vote of  shares is not
                         applicable.

                    (iii)Sole power to dispose or to direct the  disposition of:
                         Mark L.  Weinstein  has  sole  power to  dispose  or to
                         direct the disposition of 588,500 shares.

                    (iv) Shared  power to dispose  or to direct the  disposition
                         of:  The  shared  power to  dispose  or to  direct  the
                         disposition of shares is not applicable.

Instruction.  For computations  regarding  securities which represent a right to
acquire an underlying security see ss.240.13d-3(d)(1).





ITEM 5.             OWNERSHIP OF FIVE PERCENT OR LESS OF A CLASS.

If this  statement  is being filed to report the fact that as of the date hereof
the  reporting  person has ceased to be the  beneficial  owner of more than five
percent of the class of securities, check the following [ ].

Instruction. Dissolution of a group requires a response to this item.

ITEM 6.             OWNERSHIP OF MORE THAN FIVE PERCENT ON BEHALF OF ANOTHER
                    PERSON.

The  ownership  of more than five  percent  on behalf of  another  person is not
applicable.

ITEM 7.             IDENTIFICATION  AND  CLASSIFICATION OF THE SUBSIDIARY WHICH
                    ACQUIRED THE SECURITY BEING REPORTED ON BY THE PARENT
                    HOLDING COMPANY.

The  identification  and  classification  of the  subsidiary  which acquired the
security being reported by the parent holding company is not applicable.

ITEM 8.             IDENTIFICATION AND CLASSIFICATION OF MEMBERS OF THE GROUP.

The notice and classification of a group is not applicable.

ITEM 9.             NOTICE OF DISSOLUTION OF GROUP.

The notice of dissolution of a group is not applicable.

ITEM 10.            CERTIFICATION.

By signing  below,  I certify that, to the best of my knowledge and belief,  the
securities  referred to above were not acquired and are not held for the purpose
of or with the effect of  changing or  influencing  the control of the issuer of
the securities and were not acquired and are not held in connection with or as a
participant in any transaction having that purpose or effect.



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                                    SIGNATURE

After  reasonable  inquiry and to the best of my knowledge and belief, I certify
that the information set forth in this statement is true, complete and correct.



                                                     February 12, 2003
                                               -----------------------------
                                                          Date



                                                    /s/ Mark L. Weinstein
                                               -----------------------------
                                                           Signature



                                                Mark L. Weinstein (Stockholder)
                                               ------------------------------
                                                          Name/Title


The  original  statement  shall be signed by each  person  on whose  behalf  the
statement is filed or his authorized representative.  If the statement is signed
on behalf of a person by his authorized  representative  other than an executive
officer  or   general   partner  of  the   filing   person,   evidence   of  the
representative's  authority to sign on behalf of such person shall be filed with
the  statement,  provided,  however,  that a power of attorney  for this purpose
which is already on file with the Commission may be  incorporated  by reference.
The name and any title of each person who signs the statement  shall be typed or
printed beneath his signature.

NOTE.  Schedules  filed in paper format shall include a signed original and five
copies of the  schedule,  including  all exhibits.  See  ss.240.13d-7  for other
parties for whom copies are to be sent.

ATTENTION:  INTENTIONAL  MISSTATEMENTS  OR OMISSIONS OF FACT CONSTITUTE  FEDERAL
            CRIMINAL VIOLATIONS. (SEE 18 U.S.C. 1001).



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