Be aware of the customer who makes several small purchases by check or credit card that are under the amount for manager approval.
Be skeptical of a customer with only one credit card and one piece of identification.
Check to see if the signature on the card compares favorably with the signature on the sales slip.
Examine the signature strip on the credit card. A criminal may cover the real card owner's signature with "White-Out" and sign it on the new strip.
If you are suspicious of the purchaser, make a note of appearance, companions, any vehicle used, and identification presented. Call the police department at (417) 623-3131.
Is the item being purchased one that could be easily fenced for cash? (Examples include televisions, stereos, cameras, and other portable items.)
Look for "ghost" numbers or letters. Many times criminals will change the numbers and/or name on a stolen card. To do this they either melt the original name and numbers off or file them off. Both of these processes can leave faint imprints of the original characters.
Train employees to follow each credit card company's authorization procedures.
Source: Credit Card and Computer Fraud, published by the Department of the Treasury, United States Secret Service.