Yea I'm interested about the legality too. I was cut off by a police helicopter in Philly ones, they even followed me into the surface Class B and requested with the tower that I should come up on 123.025 to receive a lecture why I wasn't monitoring that very frequency... I was actually talking to Philly approach/tower, receiving flight following (since I was operating in an out of the class B) on my only (operable) radio when they tried to contact me!
"Sky Police"
