I haven't done them. Try a little search with 'drug test' and the company name as I'm sure they have been discussed including one or the other of those words. My impression is that a whole lot of the feasibility on these is the specific store you are evaluating--cooperation of staff, organization of store, size of store, etc. At one point I had thought to do them in my area when they were first being offered at $150. The price dropped to $130 before the first audit was done and since they want you to do the same location every other month, that would constitute roughly doing one 'free' audit per year per store. Others have found them wretched or not too bad, if I recall correctly. Obviously few people are willing to do them beyond their two month commitment (if even that) since the same locations in my area show up with great frequency.