Had some bats a couple of years ago in attic space above the garage - in a space that had no connection to the rest of the house.  I put up a bat house above the garden and did the 'exit only' bat exclusion deal.  Seemed relatively successful.

Now I've got one or two above the soffits again.  Since they want to live so close to me, they might as well be healthy.  Is there anything I want to make sure I don't leave out in easily accessible locations?  I'd sure feel bad if I left something out and they got into it and died.