She started to tell him that was police business, then shrugged.

And it couldn't be police business, because she'd taken a leave of absence from work.

I had never come here before, except on police business.

"I understand you were out of the police business for a while," she said.

His sister took care of the boy when he was absent, away on police business.

If so it's police business and you don't want to be mixed up in it.

This is police business and I need not go into it.

"Come and see me at the office if you want to discuss police business."

I really wasn't in the mood for police business, though, not even a bad case like this one.

You remember we once went there on some kind of police business, but it seemed to be all right.