A teller at a savings and loan drive-through accepted a cash payment from customer #1 for an auto loan. The teller appeared to process the payment, but told the customer the printer was jammed and she can't print a receipt. The customer accepted the excuse and drove away. The teller pocketed the cash and wrote down customer #1's loan number and payment amount for future reconciling. A couple of days before customer #1's monthly statement was printed, the teller recorded a cash payment from customer #2 as if it were made by customer #1. The teller pocketed the difference between the two payments. The teller continued to steal and misapply customer payments for the next two years without detection.

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Describe IT controls you would implement to mitigate this fraud risk