I saw one on TV where they were sending out mailers identifying the perps as winners of a prize, like a new big-screen TV. They were busting them right-and-left. One even said, as he was being led away, "do I still get the TV?"
The smarter ones would probably get wise to that after a while.
However, if you give them some kind of BS summons, like having bad tires on your car, call the number below if you want to have your tires re-inspected, they’ll come right in. If you’re a running a criminal enterprise, you want everything to look clean.