I have implemented an observation day. After interviewing someone that I think is a great candidate, I have them come in for a paid observation day. I explain that it is not simply to stand back and watch, but it really is like the first day of training. Tell them you want them to show you what they are capable of. It's their chance to observe your business and determine if they want to work for you — and your chance to see if they have what it takes to make it. If they stand around like a bump on a log, get rid of them, do a payout for the couple of hours they were there and save the headache of all the paperwork and training.