EXHIBIT 31.1

                         APPLIED DNA SCIENCES, INC
               OFFICER'S CERTIFICATE PURSUANT TO SECTION 302

I, James A. Hayward, certify that:

  1.    I have  reviewed  this  amended  quarterly  report on Form  10-QSB/A  of
        Applied DNA Sciences, Inc.;

  2.    Based  on my  knowledge,  this  report  does  not  contain  any   untrue
        statement of a material fact or omit to state a material fact  necessary
        to make the statements made, in light of the circumstances   under which
        such  statements  were made, not misleading  with respect to  the period
        covered by this report;

  3.    Based on my knowledge,  the financial  statements,  and other  financial
        information  included in this  report,  fairly  present in all  material
        respects the financial condition,  results of operations and cash  flows
        of the small business  issuer as of, and for, the periods  presented  in
        this report;

  4.    The small  business  issuer's  other  certifying  officer(s)  and I  are
        responsible for  establishing and maintaining  disclosure  controls  and
        procedures  (as defined in Exchange Act Rules  13a-15(e) and  15d-15(e))
        and internal  control over financial  reporting (as defined in Exchange
        Act Rules  13a-15(f) and 15d-15(f))  for the small business   issuer and
        have:

             (a) Designed such disclosure  controls and  procedures,   or caused
                 such  disclosure  controls and procedures to be designed  under
                 our supervision,  to ensure that material information  relating
                 to the  small  business  issuer,  including  its   consolidated
                 subsidiaries,  is made  known  to us by  others  within   those
                 entities,  particularly during the period in which this  report
                 is being prepared;

             (b) [Omitted pursuant to SEC Release No. 33-8238];

             (c) Evaluated the  effectiveness  of the small  business   issuer's
                 disclosure  controls  and  procedures  and  presented   in this
                 report  our  conclusions   about  the   effectiveness   of  the
                 disclosure  controls  and  procedures,  as of  the  end  of the
                 period covered by this report based on such evaluation;  and

             (d) Disclosed  in this  report  any  change in the small   business
                 issuer's  internal  control  over  financial   reporting   that
                 occurred during the small business issuer's most recent  fiscal
                 quarter (the small business  issuer's fourth fiscal  quarter in
                 the case of an annual report) that has materially  affected, or
                 is reasonably likely to materially  affect, the small  business
                 issuer's internal control over financial reporting;  and

  5.    The small  business  issuer's  other  certifying  officer(s)  and I have
        disclosed, based on our most recent evaluation of internal  control over
        financial  reporting,  to the small business  issuer's auditors  and the
        audit  committee of the small business  issuer's board of directors  (or
        persons performing the equivalent functions):

             (a) All significant  deficiencies  and material  weaknesses in  the
                 design  or operation  of  internal   control  over    financial
                 reporting which are reasonably likely to adversely   affect the
                 small business issuer's ability to record, process,   summarize
                 and report financial information; and

             (b) Any fraud,  whether or not material,  that involves  management
                 or other employees  who have a  significant  role in  the small
                 business issuer's internal control over financial  reporting.

Date: October 13, 2006

/s/ JAMES A. HAYWARD
--------------------
James A. Hayward
Chief Executive Officer