You have to suppose with a story like this.
If I came home and found my house had been robbed, called the police, and they told me there were here while I was being robbed, I think I'd be pretty pissed about it.
You were here and you didn't arrest them, why?
Because we called whoever was in the house out and he didn't respond, so we just left!
You left after my neighbor called you out telling you there was somebody in my house that wasn't me?
Yeah, you know, we didn't want to violate his rights just in case they were allowed to be there!
So you didn't pursue the matter further until you knew for sure?
You betcha!