Associating and/or disassociating a mobile point-of-sale scanner device with a particular shopper. Shoppers may be identified, for example, using biometrics or by scanning a loyalty card. As an example of using biometrics, the shopper's fingerprint may be scanned as a trigger of the scanner is activated...http://www.google.fr/patents/US7389934?utm_source=gb-gplus-shareBrevet US7389934 - On-demand point-of-sale scanner access
