When I was on management training at our local Morrisons (a period of my life I try to forget, we were taught various techniques to spot shoplifters. That store, like some other supermarkets, is deliberately designed so that when customers walk in, they walk anti clockwise around the aisles. This is mostly done for nefarious sales reasons that are too long winded to explain here. We were told to observe anyone without a shopping basket or trolley who wasn't walking through the store anti clockwise. Potential 'skittish' behaviour. Morrison's used to used a code over the P.A. so if a female was actually spotted shop lifting, we'd hear "CAN MRS WHITE COME TO CUSTOMER SERVICES PLEASE" .. if it was a man, "CAN MR WHITE COME TO CUSTOMER SERVICES PLEASE" .. if instead it was some sort of violent situation, if would be the same announcement but Mrs Black or Mr Black. Then all managers moved in to deal with any incidents. We had a security guard but he was crap and spent half his time chatting up the female staff.