Back when I first started mystery shopping in the 19080's, I had what was my least favorite type of shop. It was a pay and dash. The client wanted the shoppers to select a piece of candy and leave the exact amount or slightly more on the counter and run out before getting a receipt. I did exactly that and when the cashier called me back and I kept going out the door,.The security guard who was over 250 pounds of pure muscle came out and grabbed my arm and brought me back in the store. Despite the fact that I had left $1.00 for a .78 cent item, he made me speak to the manager. Several customers in the store stood there watching as we waited for the manager to come out of of the back. I asked if I could speak with him in the back and he insisted I spoke to him with the people watching. We had been instructed that in such an instance, we were to show our id to the manager letting them know what we were. Needless to say, I never went back to that location. I also refused any of those types of assignments, especially since I never prefer to draw attention to myself.