Shops have something called a "million dollar stop" policy. Basically, the idea is if the shopkeeper makes an unlawful stop, they could be sued and it could cost them a million dollars. Stopping someone once they are outside of the store is a way to be guaranteed they have stolen. Under Illinois law, evidence that someone has taken an item from the store past the last point of sale can be considered evidence of intent to steal.
Typically what happens in reality is this: The store gets stolen from multiple times. The first time, they don't realize it. The second time, they have a camera watching you and they follow you for as long as possible. Otherwise, why would the manager follow you if you have not stolen? So, they follow you until you walk out the door, at which point they make the stop. That's why they let you steal multiple times - because they are rarely certain the first time that they have been stolen from.
Answered on Sep 29th, 2014 at 2:56 PM