He was already listening in on the police radio

Probably because that would end up with him using super strength and exposing himself

He was in super hero protection. As the man said it was time that their secret identity became their only identity. So being a cop would expose him. Man was a insurance clerk yet STILL was reveled and they even say it happen before.

he's literally superman on crack; ban him all you want, won't make an ounce of difference.