The government is building a nationwide surveillance network.

The patrol boat is patrolling the sea area.

He always watches over us as our guardian.

I went to the police station yesterday.

Police dogs are very effective in tracking criminals.

He was terrified of living in a police state.

The head of the police station explained the details of the incident to the press.

He was caught by the secret police.

A municipal police was established in my town.

Every weekend, I do volunteer work at a local shelter.