maureen tierney recently walked into bed bath and beyond...and picked up a bunch of stocking stuffers she figured her family would love. "it's a product that's supposed to protect your credit card from identity theft....it has a special metal blocking aluminum alloy." the product is an rfid blocking credit card sleeve. you may have seen internet posts about how someone can rub up store....and capture your credit card number. but maureen wonders if it really does anything."it looks like aluminum foil on the inside, and i thought, well i don't know about this!"(matarese field "the idea behind these credit card protectors is simple. your credit card inside a leather wallet has no protetion against a radio frequency card reader." so we went to an internet securtiy expert, appolonia garcia of "healthguard security" ...to find out if these little foil sleeves are a good idea. garcia says they do what they promise...blocking rf waves. but he says in most cases you don't need them. why not? because that little chip or magnetic sprip in most cards is not an rf chip....it can't be read by proxi