Not in ColdFusion 8. However, it was added in CF9.
You do not need to rewrite the whole function, you can do this:
<cffunction name="foo" returntype="string" output="false" access="private"> <cfscript> return "bar"; </cfscript> </cffunction>
If you have access to CF9, the new syntax is:
private string function foo() output="false" { return "bar"; }
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