EXHIBIT 31

                         SALIVA DIAGNOSTIC SYSTEMS, INC.
                                  JUNE 30, 2004

                                 CERTIFICATIONS
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I, Leo Ehrlich, certify that:

      1.    I have reviewed this quarterly report on Form 10-QSB of Saliva
            Diagnostic Systems, 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 registrant as of, and for, the periods presented in
            this report;

      4.    I am responsible for establishing and maintaining disclosure
            controls and procedures [as defined in Exchange Act Rules 13a-15(e)
            and 15d-15(e)] for the registrant 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 registrant, 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)   Evaluated the effectiveness of the registrant'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

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

5.    I have disclosed, based on my most recent evaluation of internal control
      over financial reporting, to the registrant's auditors and the audit
      committee of the registrant'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 registrant'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 registrant's
            internal control over financial reporting.

Date: August 5, 2004

                                 /s/ Leo Ehrlich
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                                 Leo Ehrlich
                                 President & Chief Financial Officer