Police is one of your civic buildings.
Police fight crime and sometimes,crime goes away before you know it.
Here are the descriptions of each police building:
Small police station:
A small police station is good for a small city.A small coverage and 2 police vehicles.
Large police station:
Good for large cities.A large coverage and 4 police cars.
City jail:
City jail can rarely make strikes.If police coverage is not covering the jail,prisoners break buildings.
Federal prison(Reward building):
This prison holds exactly 3,000 prisoners at total.The downside is its one of the negative buildings,causing a strike,along with the convention center.
There are levels for crimes.
Flashing and pie throwing goes with the low level.There is no need for a police to stop it.They will learn the lesson after a while.Car theft goes with the medium level.Police can stop them but sometimes,they learn a lesson.Arson and assault is in the high crime level.Police is highly recommended to stop them since they rarely learn a lesson.
So,those are the tips on a good police system.