Exhibit 31.2

# CERTIFICATIONS

I, Samuel E. Reinkensmeyer, certify
that:

|1. |  | I
have reviewed this Quarterly Report on Form 10-Q of CNS, Inc.;
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|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;
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|4. |  | The
registrant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
registrant and have:
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| | (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;
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| | (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;
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| | (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; and
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| | (d) |  | 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
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|5. |  | 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 functions):
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| | (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
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| | (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.
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|Date:   December 6, 2005 | /s/   Samuel E. Reinkensmeyer                                                         
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|                         | Samuel E. ReinkensmeyerVice President of Finance,Chief Financial Officer and Treasurer

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