I have an old one so that can't do trunking so I can't hear the police in my location so I want to get a better one so I can see when their emergency response time is around 30 minutes from the first 911 call.
Some states have laws prohibiting scanners where they can destroy them if they find them in your posession so if you get a portable one don't drive into states like KY and NY or get a HAM license so you can carry it.