This reminds me of a story, I don't remember where it was from, but I saw it on the news a few years back. Essentially the police tried to set up a sting operation where they had a guy go to a mosque, and pretty much go up to random people and say "Pssst, hey, you wanna help me make a car bomb?". The members of the mosque where pretty freaked out, naturally, thinking "the hell is this crazy motherfucker doing here?". I think the police ended getting dozens of calls from concerned people who encountered the guy in the mosque that day. If I remember right, the chief didn't know until he saw all the reports and subsequently found out it was one of his own guy's operations, and he was pissed that they had done something this stupid.