None of my cards have RFID tags. I don't feel great about the RF blocking sleeves that are out there -- there are ones that don't work very well, and others that are bulky. If I were trying to intercept RFID data I'd just set up somewhere near where people have to take them out of the sleeves to use them. They can be read from at least 70 feet away with off-the-shelf technology.

I would suggest that if you do carry any cards with RFID tags, consider giving the RFID chip a couple of good hard whacks with a hammer, if it's legal for you to do so.