A Connecticut man learned that the hard way. It appears if you call the police to ask them whether or not your marijuana plants are illegal, they will come over to your home and check personally. This can land you in trouble.
In a related matter, some guy named Arne Duncan applied similar foresight, ran a failed program in Chicago, and was elevated to US Education Secretary, where he's busily replicating his unsuccessful plan for an entire country.
Believe it or don't.