2

He must have called the police.

OR

He must have called police.

I think we use the first one when we know about a specific group of police officers which we have called and the second one, when, we talk about any police group which we don't specifically know.

Am I correct?

-1

I would say "the police."

I think the only time I would not put "the" before "police" is if "police" is the subject at the beginning of the sentence or phrase.

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