For the college students: nothing. I'm a prof at their school. I know their name, I know they're truly a student at their school, that's all I need. For others (a permanent...(more)6-13-2016 9:49am+1 like
sitter), I go online and check nothing comes up in a quick search. And I keep a copy of their passport (I don't quite know why; I think to make them feel a bit more accountable to me.) That's all; I haven't paid for a formal background check.