we both work for a law enforcement agency. He has a special set of skills so he is usually at this sort of thing. Don't worry. He's not beating up or arresting innocents. He doesn't arrest people.
Might surprise people to know, but just because someone's police - even those who arrest people - doesn't mean they're heavy handed or racist IME. In fact there are quite a few around who are actually human beings even!
...Pardon the sarcasm, but it gets to me that people are so biassed against 'police' as a whole too. IME they are generally very good people, doing an often unpopular job, but of course, there can be 'bad eggs' in any basket.