Dear Ginger,
I personally didn't have to perform many strip searches (one of the priveledged senior staff as you are so found of saying), but to answer your question directly, not often. The word was out in Ft. Lauderdale. The last one I did where I actually found something (and maybe Marshall or others remember this because the guy was from Albany, Ga., and what was found was shown to the group as an example, if you try you will be caught): The guy pulled down his underwear and had his works kit with dope in it taped behind his scrotum. I remember this one so well, not because of the dope, but, as a man I cringed, I could not fathom the pain he must have endured sitting in a car from Albany to Ft. Lauderdale after seeing what he'd done.
How hard is it to figure out that if your running a drug rehab, every precaution has to be taken to keep drugs off the premises.
Again, it blows my mind that this even needs explaining.