US Patent 7454365 Point of sale security method

A method of confirming security of personal items belonging to a shopper during a point of sale transaction is disclosed. The method includes sensing a signal of a weight sensor indicative of a weight of the personal items placed upon an interface of a security monitor of a point of sale checkout device. The method further includes activating an alarm in response to sensing a change in the signal of the weight sensor that is indicative of a removal of the personal items during the point of sale transaction. The method also includes activating the alarm in response to sensing a continued state of the signal of the weight sensor following the point of sale transaction.