You can't really do it any more 'cause they keep scanners locked up, but another trick was to program the freq that the wally world radios used and then turn all the scanners up full blast and when they start talking smack about each other or customers, it got blasted all over the car electronics dept. muwahhahha...
Not that I would DO such such a thing...
I would think that most businesses would use ctss tones to keep people from just locking on the freq. and broadcasting.
Get them tones, and you have the keys to the kingdom..
YOu can get the freqs for just about everything in various frequency guides that are available