When that rumor about the key cards having credit card info went around the internet for the first time a few years back, it was attributed to someone at the Pasadena, California, police force. I called that person's office -- turned out it was a real person -- and eventually got to someone who explained the strange sequence of mistaken events that led to the rumor getting around. They also made it very clear that there was nothing behind the statement, it was totally false.

So I was actually able to find the originator of the myth and get it debunked right at the source. It's been a while, and I don't remember the specifics, but I sure remember doing it!