Because of its tremendous utility for tracking everything from sales leads to exhibit materials, RFID (Radio Frequency Identification) is fast becoming the "it" technology for the trade show industry. But some are concerned that RFID tags, which are popping up on everything from attendee badges to shipping boxes, could be a serious security breach waiting to happen.RFID tags contain microchips that broadcast data to readers using radio waves, and critics complain the system allows anyone with a reader to access the data. But RFID entrepreneurs like Art Borrego, CEO of Alliance Tech in Austin, TX, say the security issue is minor as long as no private information is stored on the tags. "With RFID," says Borrego, "an attendee who registers for an event will receive a distinct identification number, and that number will be installed on his or her badge. And on the show floor, the only thing that is being read via radio waves is that unique registration number. There is no personal data being exposed," only random numbers that identify badge holders to reader computers.The bottom line: Think twice about the information you'll put on attendees' RFID tags.