A method of marking products purchased through a self-service checkout terminal includes scanning a product to be purchased into a computer and issuing a tamper resistant label from a printer at the self-service checkout terminal. The tamper resistant label includes a visual indicator including product data section, and a radio frequency identifier including product data portion. The method also includes adhesively bonding the tamper resistant label to the product scanned into the computer such that removal of the tamper resistant label from the product destroys the product data section of the visual indicator and the radio frequency identifier. Finally, the method includes scanning for each of the visual indicator and the radio frequency identifier after the product passes through the self-service checkout terminal to verify that the product was scanned into the computer.