The entire state of Minnesota has a P25 system (called ARMER[0]) for public safety, and I’ve done the same thing with SDRTrunk. It is fascinating! But you need to filter out a LOT to really follow anything otherwise you'll end up hearing about shift changes on the light rail while you're trying to listen to updates on a car chase.

Unfortunately the same things started to happen and now some users (Hennepin County Sheriff recently) are encrypted by default.

[0]: https://www.radioreference.com/db/sid/3508