In this article titled 'The RFID Hacking Underground', the author looks at the uses and abuses of RFID. In particular, the way it can be used in daylight robbery!:
""I just need to bump into James and get my hand within a few inches of him," Westhues says. We're shivering in the early spring air outside the offices of Sandstorm, the Internet security company Van Bokkelen runs north of Boston. As Van Bokkelen approaches from the parking lot, Westhues brushes past him. A coil of copper wire flashes briefly in Westhues' palm, then disappears. ..
...RFID chips are everywhere - companies and labs use them as access keys, Prius owners use them to start their cars, and retail giants like Wal-Mart have deployed them as inventory tracking devices. Drug manufacturers like Pfizer rely on chips to track pharmaceuticals. The tags are also about to get a lot more personal: Next-gen US passports and credit cards will contain RFIDs, and the medical industry is exploring the use of implantable chips to manage patients. According to the RFID market analysis firm IDTechEx, the push for digital inventory tracking and personal ID systems will expand the current annual market for RFIDs from $2.7 billion to as much as $26 billion by 2016.
The tags work by broadcasting a few bits of information to specialized electronic readers. Most commercial RFID chips are passive emitters, which means they have no onboard battery: They send a signal only when a reader powers them with a squirt of electrons. Once juiced, these chips broadcast their signal indiscriminately within a certain range, usually a few inches to a few feet. Active emitter chips with internal power can send signals hundreds of feet; these are used in the automatic toll-paying devices (with names like FasTrak and E-ZPass) that sit on car dashboards, pinging tollgates as autos whiz through."