With a gas station mystery shop, its a good idea, if possible, while shopping to try and wait until you can get a customer right behind you in line. (but don't spend so much time doing this that the clerk is thinking you're stealing stuff). But if possible, if you can manage it when someone in line is behind you (if said customer has a bunch of lottery tickets in their hand ready to go, then you're in luck, because that transaction will fully be taking the clerk's attention for a little while), that clerk will become focused on them while you're getting your phone out and taking photos.
Also, scope out the location as soon as you pull into it, while fueling (fuel slowly, don't fully engage the handle), and while walking from the car to the store to find where any infractions might be. Then, when you leave the location, you know right where to take your pictures quickly, get in the car, and leave.
Edited 1 time(s). Last edit at 02/15/2019 12:39PM by tcurione.