Re: perhaps itself encrypted with a key known only to law enforcement
Do you remember Snowdon? Perhaps that was too long ago: do you remember the CIA leaks that are currently being dribbled out?
Here's the thing: information leaks from law enforcement agencies. And when this super-secret key leaks, which it will, *every bit of communication it protected is now plain text*.
Seriously, you need to think a bit harder about this, because you are looking silly here.