The biggest problem I've had in hiring people is for them to pass the piss test. JESUS dung, really.....Seems no body pinching their zits while living in their mom's garage and playing WOW wants to put the blunt down long enough to get a job.
And depending on where you're working - the background check. We had one girl apply for the pharmacy...she has a felony for theft. And she wants to be around drugs? Lady be crazy.