[bilekas]

This is actually a great point I hadn't even considered. I had heard of cretins using a small grease film like a tiny layer of vasolene etc on pinpads and then after the victim uses, they would shine a light on it to see.

[dijonman2]

Grease films are typically detected by the user. Better to dust the keys with a UV sensitive powder and inspect the ATM after pin entry.