CTown Supermarkets

So before going to CTown supermarket I went to BJ's I had my items in a huge zippered bag the manager of CTown happened to see my wife and myself with said bag's and told us that we had to check in our bag's no problem there everyone has to do this so now we shop around for maybe 20 and as we're standing on line I notice the manager open the bags we checked in and start searching them so I rush over and ask him what he was doing and his response was we have people who come in and steal now my question is how can we steal anything when our bag's was left at the door seems like profiling to me so never again will I enter this store