Credit Card Forensics

The notion of anomaly deserves further explanation.. Recall that our goal was to detect anomalies, one example of which is credit card information on a hotel room key. Of course, the converse would also be an anomaly. Though we haven't detected this as yet, it's entirely possible that criminals could put hotel room information on a credit card so that they might conceal that they have access to a victim's room. Again, the criminal reasoning would be similar to the “more-than-2” case: if criminal activity were suspected in a hotel room, a holder of a hotel room key to that room might be suspect. But what is the likelihood that an investigator will swipe a worn, embossing-reduced credit card in a hotel room key?