i had worked for wal-mart and ment the people that do that per 1 super wal-mart theres usually 2 people that do the specific store and only 1 of them works at any given time during the day, therefore only 1 person is on duty at all times doing that partrolling the entire store and its not likely that they can see everything going on in the whole store, and yes they sucked at it and actually they are instructed to ask you what you think of things if they believe you are shop lifting to try to make you nervous and drop what you heave and leave the store without leaving with the merchandise, although it would be pretty funny to do what tagej said and ask them what they think of items instead of letting them ask you, whether you shop lift or not, also even if you do steal anything they're not allowed to do anything except follow you until you officially leave the store then you've stolen it, then they get to call police.
