There are very few violations of the FCC's rules in general partly because the FCC regulates and certifies hardware manufacturers of radio equipment, so it's very difficult to purchase equipment that doesn't follow the rules. You can see this happening in the Wifi space where the FCC is clamping down on dd-wrt at the device manufacturer level because the software allows people to violate that frequency's rules. People with the right skills can build custom equipment to violate the rules but it's rare. And for the few people that do try to do things like pirate radio the FCC hunts them down and the penalties are stiff.

My point being that for the most part the FCC's regulatory scheme works at keeping people playing by the rules without extra layers of technically complicated security.