text:  Adrian Beck, an emeritus professor at the University of Leicester in England, advises retailers on how to reduce theft. They can generate loss, and I think we need to be careful what we mean by this, which some of it could be due to theft, but also some of it could just be due to people making mistakes. I mean, nobody really trains the public in how to use these systems, and so it's very easy for people to make mistakes. All retailers who are now using it are getting more and more concerned about the amount of loss that they're now experiencing through this form of checkout.