A good rule of thumb (I teach all of my children relatives this) is that if you approach somebody they're probably ok. If they approach you, watch out. In your

A good rule of thumb (I teach all of my children relatives this) is that if you approach somebody they're probably ok. If they approach you, watch out. In your example, you reached out to the police. If I called the police, I'd talk to them, as they'd be predisposed to like me. Otherwise, if they just come up to me and start asking random questions, I'll tell them to go away politely unless they had a warrant. The police can't arrest you without probable cause. And just saying nothing is not probable cause.