In CA at least there are pretty strict licensing requirements, background check, the whole deal.
A background check's no big deal; I have immaculate records, nothing on them.
And many years ago when I was a records supervisor for Immigration & Naturalization, I had some sort of national security clearance, some sort of level that only 3 out of 500+ people in the office there had.
I don't think I'd have any problems with a credit check, police check, drug-alcohol check, whatever.
I've always lived a dull life, never getting into trouble.
Why that is, only God knows.