Exhibit 31.2

# CERTIFICATIONS

I, Samuel E. Reinkensmeyer, certify
that:

| | 1. |  | I
have reviewed this 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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| | 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;
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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)) 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: August 5, 2005

| | /s/  Samuel E. Reinkensmeyer                                                            
| | ----------------------------------------------------------------------------------------
| | Samuel E. Reinkensmeyer
Vice President of Finance, Chief
Financial Officer and Treasurer

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