Exhibit
        31.2
 **CERTIFICATIONS**
 
 I,
        Diane
        J. Ryan, Chief Financial Officer of Implant Sciences Corporation, certify
        that:
   1.  
        I have reviewed this 10-QSB/A Amendment No. 1 of Implant Sciences
        Corporation;
  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)
        Designed such internal control over financial reporting, or caused such internal
        control over financial reporting to be designed under our supervision, to
        provide reasonable assurance regarding the reliability of financial reporting
        and the preparation of financial statements for external purposes in accordance
        with generally accepted accounting principles;
  (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:
                  June 29, 2005/s/
                  Diane J. RyanDiane
                  J. RyanChief
                  Financial Officer
  31