When self-service checkout (SCO) first launched in the United States in 1992 there was considerable scepticism and, perhaps not surprisingly, concern that huge losses would follow. Despite conflicting evidence on their impact on shrinkage, and customer theft in particular, consumer-oriented payment systems are an increasingly common feature of the retail environment. This paper reviews how the move to SCO has affected retail theft. Drawing on recent market research surveys suggesting that up to a third of customers regularly steal when using SCO in supermarkets, the paper outlines the aetiology of a new breed of shoplifter, ‘the SWIPERS’, and presents a typology of these offenders.