I'm worried about his health condition.

He is in a state of fatigue.

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.

We conducted a questionnaire survey for the development of new products.

We need to conduct a factual investigation on this issue.