**Exhibit
31.2**
 
 **CERTIFICATIONS**
 
 I,
Roderick de Greef, Chief Financial Officer of Cardiac Science, Inc. (the
“registrant”), certify that:
 
 1.
    I have reviewed this quarterly report on Form
      10-Q for the quarterly period ended March 31, 2005;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 quarterly report;4.
    The registrant’s other certifying officer 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
      15d-15 (e)) and internal control over financial reporting (as defined in
      Exchange Act Rules 13a-15(f) and 15d-15(f)) 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 quarterly 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 reporting purposes in accordance with generally
      accepted accounting principals;c)
    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; andd)
    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; and5.
    The
      registrant’s other certifying officer(s) and I have disclosed, based on
      our 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
    function):a)
    all significant deficiencies and material
      weaknesses in the design or operation of internal controls which could
      adversely affect the registrant’s ability to record, process, summarize
      and report financial data and have identified for the registrant’s
      auditors any material weaknesses in internal controls; andb)
    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:
      May 10, 2005
    /s/    RODERICKDEGREEF**Roderick
      de Greef**
      **Chief
      Financial Officer**