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It's an air filter, not a carbon filter. If he had active carbon in the fliter, or between two filters, then it'd be a very cheap carbon filter, quality would depend on how the carbon was placed, air flow, lifetime, renewability, etc.

A warrant would have to be issued first, and they generally aren't issued without probable cause, but a tip(not anonymous) from anyone is generally enough for quite a few judges to issue a warrant. It all depends on the locality, sadly.