Im a student currently enrolled in school and recently was tasked with creating a magazine about a cause and chose law-enforcement radio encryption. Just wanted your guy’s opinion, its not the best thing ever but its something.
If you haven't already wrapped it up, here are a few thoughts to consider -
1. Cite the origin/law that created the encryption chaos to begin with (sorry I don't have it in front of me). As you state, it is intended to protect private information, for which there are many alternatives. The main point is, Police Chiefs and other agency executives are bending the law in order to get a new radio system funded, which is fully encrypted.
2. Some systems, like the one in installed in my area a couple of years ago, can be switched by the dispatcher to analog at the push of a button, or vice versa. So all day long they can be analog, but could simply push the encrypt button for private info.
3. Many agencies send private info to the patrol officer MDT, encryption isn't needed 80 percent of the time.
4. You kind of already say it, but to be clear, if most agencies (federal, state and local) are encrypted, then who will be the watchdog?
5. Remember the lesson learned from 9/11? Encryption by mulitple agencies could have the same consequences, they will not be able to talk to one another under dire circumstances.
Good work !