I have completed two different training sessions and a background check by the diocese just so I can be an usher/greeter. Anyone who might be working with children for over an hour per month is required to do this every three years. An adult working with, say, a boy scout troop can't send anyone to a bathroom unless the adult has checked it first and then an older kid must accompany a younger.

This type of requirement has been the rule since 2002.