How is employee theft detected?
We detect when a transaction has likely taken place, but the employee failed to input said transaction into the POS system. This form of fraud is called Skimming.
i.e. A happy customer comes into your store, orders 3 large lattes and pays in cash. As the employee recieves the money, he places it in the cash drawer, hands over the change and gets started on those drinks. As the sale is not registered in the POS, there is no ticket to be printed. The money from this transaction (and others) will be pocketed by the employee at a later time.
Skimming is hard to detect because even if sales are audited, there are no records of those sales, and therefore no missing cash.