Another "trick" for this... How many people know what [insert federal agency] credentials look like? I have a friend who is one of the 2k IRS Criminal Investi

Another "trick" for this... How many people know what [insert federal agency] credentials look like? I have a friend who is one of the 2k IRS Criminal Investigation Division agents in the entire country. He's full-blown armed federal agent a la FBI, etc. He tells me it's very common that when he goes out to do an "interview" people say he's not real and they're calling the police, slamming the door in his face. The local cops show up, check him out, and then go back to the door with him. In his area he (of course) personally knows many local cops and they'll show up laughing "Oh another one, huh?". It doesn't bother him at all and I seriously doubt a scammer/impersonator would stand around waiting for the police to show up and then have the gall to try to con /them/. Additionally, they have undercover vehicles (of course) but when he goes out for interviews like this it's in the classic "Oh yeah that's a cop car" vehicle with US Government license plates.