Some companies have policies in place that say the suspected shoplifter must pass the point of sale before being stopped and some don't. Its kind of a judgement call. If a little old lady sets a greeting card on top of her open purse then no you wouldn't stop her. Same lady puts the card in her purse and zips it up then she could be stopped. If a person takes a sandwich from the deli container and consumes it but still has the container in the cart when they get to checkout, you would watch to see if it is delcared with the order. Same person eats the sandwich and throws the container on the shelf then yes that person could be stopped. I work in a store that has a very bad problem with shoplifting. In the past 5 years we have had over 300 arrests. We have called the police many times and had the person stopped in the store before they ever reach the front of the store and have never had an issue. The laws are different in every state.