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)     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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| | (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
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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, 2004

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

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