Do you mean cookies CFID and CFTOKEN? Or session structure? You may have expired from cookies as follows:
<cfcookie name="CFID" value="" expires="NOW" />
<cfcookie name="CFTOKEN" value="" expires="NOW" />
but if you want to clear the session area, you have to do this:
<cfscript>
structClear(Session);
</cfscript>
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