It's the control freaks, the people who stay late everyday and never go on vacation that are most likely to be robbing you blind. Each mod should have mandatory off time or be banned for a few weeks out of every year, at least so they don't get too comfortable with their position.

It's how we caught which manager was stealing from us and got the evidence that our accountant was funneling money out to herself (although it was noticing when she bought that new car and put her children into an expensive private school that created the suspicion).