They can’t have really gone silent, they are using different frequencies or some sort of encryption. There HAVE to be ways of intercepting the transmissions.
Sadly many LE departments have become the secret police blocking public information, sanitizing reports, and outright censorship all while saying “OFFICER SAFETY” to anyone that questions the secrecy.
The digital radios can be encrypted,and the system is programmable so that only authorized radios process the information.
The individual user radio is remotely controlled by the system computer.
You serfs don’t need to know what the enforcers are doing.