[OrgNet]

The most shady places are probably gas stations/gas pumps and restaurants. They like to install card skimmers on gas pumps around here, maybe that is where it originates from. But most of the time, they cancel my card before any suspicious transactions are recorded.

[joombaga]

It's good to give those readers a tug. The skimmers aren't usually affixed well.

[OrgNet]

I do that often and never found one... some can even be hidden inside the slot: https://www.geek.com/chips/this-card-skimmer-is-so-slim-it-w...