Feds are shifty bastards. I had one come to my house. When I refused to speak, and I started shutting the door, they stuck their hand in so they could claim assault if I shut it. Fortunately I was using my hand to close it, rather than slamming it as I normally do, and I was able to stop it before it hit their hand. We stared at each other in silence for a solid minute and they left. Fucking weird.