I used to do bar/food compliance shops for a Dallas based chain in Dallas about 4-5 years ago. They used to ask me for my description, what I wore and where at the bar I sat. I'm guessing it was so management could review the video of my shop and compare or view along with my commentary.
The reports were pretty intensive but I enjoyed the reimbursed drinks and food and the clientele I got to meet while doing the shops, so I did quite a few. I felt the scheduler liked me and sometimes I would shop two locations in a single night as they would have different restaurants next door to each other.
The interesting thing was there were many times when there was a complete change over of the bar staff month to month as I did these shops. I only felt I was doing my job and not ratting out any of the staff. If they had been doing their job as they should have, I feel I might have seen the same staff month to month.
I don't think I saw many bar staff breaking the shopping report rules, so perhaps, there was just that much turn over in this chain's staff.