A statistical basis for use in a self-scanning checkout system determines how many items to check in a shopper's shopping cart for incorrect or missing scans as well as which particular or types of items to check to determine if they were properly scanned, if the shopper is determined to be audited....http://www.google.ca/patents/US6092725?utm_source=gb-gplus-sharePatent US6092725 - Statistical sampling security methodology for self-scanning checkout system
