Trust is earned. And when we send our kids to complete strangers we are desparetely in search of that trust factor. With my first born, I loved his babysitter from the second I met her. She had a beatiful personality and was very loving. Her house was clean, bright and toddler friendly. Her husband and children were just as charming. BUT as much as I liked her there was that trust factor because she was a stranger. So yes, the police check gave me a piece of mind. You are right. )