"Waitrose have done it for at least 5 years. And Safeway before them....however, we all know what happened to them!"
I think Waitrose are not doing too badly and Safeways were taken over by Morrisons. I don't think the fact that they may or may not have been incurring losses due to self scanning had any influence on that deal.
"It is far easier to defend yourself in court if you say you forgot to scan the items. Most shop lifters have to try and leave the store after hiding shopping on their person. This is open for people who can take a gamble and not have to much of a fear of being caught. "
As with all theft, Dizmo, the prosecution has to prove that the accused took the goods deliberately and intended to permanently deprive the owners of them. It is scarcely any more difficult to prove this if the goods have been taken from a self-scanning shop than it is if they were taken from a conventional shop. It is not necessary for the suspect to have left the shop with the goods. Usually just passing through the pay point is sufficient. Furthermore, most prosecutions of low level shoplifting are supported by the fact that the accused has no means to pay on their person at the time of the offence. For these reasons I do not believe that self-scanning presents a significant increase in the risk of theft.
Fear of being caught is not much of an issue for habitual shoplifters. They stand virtually no chance of being sent to prison (and for many of them a few weeks inside is quite a comfortable change from their usual existence anyway). They are usually dealt with by way of a fine which is simply added to their "account" and they have £10 a fortnight deducted from their benefits.