Sometimes it's fun to browse the laws to see what the lawmakers say we can't do. Here's an example from days gone by.
It is said that the one invention that benefited law enforcement more than any other was the two-way radio. In the days of Bonnie and Clyde a pair of bank robbers could hit a bank then hit the road in a fast car and leave the cops far behind. That can still happen, but with the ability to radio ahead the escape could be made a bit more difficult.
When the police radio came into usage the police no doubt were very possessive of that technology. If the bad guys/gals listened in then the radio wasn't as useful.
So we find on the books a half century old law that prohibited listening and telling. Here's one in the Midland, Texas, municipal code.
Title VI, Chapter 1, Section 9.
Police radio; interception of communications.
No solicitor, or other person, not being authorized by the City, shall intercept any communication and divulge or publish the existence, contents, substance, purpose, effect or meaning of such intercepted communication, and no solicitor or other person, not being entitled thereto, shall receive or assist in receiving any message emanating through the medium of KKA-662, and use the same or any information therein contained for his own benefit, or for the benefit of another solicitor or person. (Ord. of 3-24-1953)
The FCC archive search yields no information for the call sign KKA-662, so it's probably been dead a long time. Anyway, it appears to be okay to listen, but don't tell anyone what you heard, and don't use the information to benefit anyone. It's not clear what the solicitors would do with it, try to sell insurance to burglary victims maybe. Do you suppose anyone has ever been convicted under this code section? I have my doubts.