My father found some drugged out kid sitting at our kitchen table when he came home one day, amazing. Good locks, good signage, cameras, it's the way to go.
Funny thing is that those parents of mine were usually sticklers for locking their doors, even the storm door. They were old so I figure they knew friends were coming so stayed in their chair and told them to come on in and the door didn’t get locked.
Having a doper sitting at my kitchen table when I got home would scare the hell out of me.