Credit card bag swiping trick
March 5, 2007 2:50 PM Subscribe
Why did this credit card swiping trick work?
posted by baphomet to work & money (24 answers total) 13 users marked this as a favorite
Recently I was purchasing gasoline, and went inside to pay. The clerk who swiped my card was having difficulty getting it to read (the reader was built into the keyboard). One of his co-workers proceeded to place my card into a white plastic bag (of the type with "thank you" printed repeatedly in red ink- you've probably seen them) and swiped it through the reader, successfully scanning my card and allowing me to conclude the transaction.
I mentioned this casually to a friend and he said that at a restaurant he once worked at, plastic bags were attached to the computers because they wouldn't read many cards if you didn't bag them first.
My question: why does this work?