You can regulate the NSA and CIA too, if you really want.
Actually, as another commenter mentioned, they probably already are doing it. It would be stupid to think otherwise.
> The people of America seem to be fine with it.
The people don't care that they're being watched. That's the main lesson I took from the snowden leaks. I think most people might even like it because they think it means there will be less crime.
The NSA's warrantless surveillance program (https://en.wikipedia.org/wiki/NSA_warrantless_surveillance_(...) and the CIA's Operation CHAOS (https://en.wikipedia.org/wiki/Operation_CHAOS) are two examples of this behavior.