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 10, 2006

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