I don't often shop @ Wal-Mart; but I do shop @ Sam's. The receipt checkers just put the Sharpie® mark on my receipt without looking at it. I think @ my Sam's store, they actually check minorities more thoroughly. I was told once by a former employee that @ Sam's they are mainly concerned about theft by friends of employees in which the employee is complicit in the theft.
Loss prevention folks will tell you that is the majority of shrinkage, not fat momma off the street hiding a TV under her mu-mu.
I used to work at Sam’s...you wouldn’t believe the security procedures they have in Sam’s and Walmarts. The security cameras are unbelievable. Let’s just put it this way, they are not cheap and do not give fuzzy pictures. lol