The State Department will be implanting RFID tags in all U.S. passports issued starting October 2006. Radio Frequency Identification (RFID) tags are basically tiny transmitters that broadcast stored information; in this case, that information will include lots of personal details about the passport holder. Despite the security measures being taken — a mild encryption key and some shielding to reduce the distance from which the transmission can be received — some predict that it will not take long before the encryption is cracked and superstrong receivers are invented, allowing snoopers to grab your personal information from afar. It is even conceivable that terrorists could develop RFID-triggered bombs that would be set to go off whenever they sense an American passport nearby. Experts disagree as to whether the U.S. system really poses such risks, but why take a chance? You may prefer to renew your passport now.