FORT LAUDERDALE – OCTOBER 04: A tuck hauling a shipping container drives through the radiation portal scanner at Port Everglades October 4, 2007 in Fort Lauderdale, Florida. The device is being used to check all containers for potential radioactive materials before they leave the port. The radiation portal scanners are being deployed across the nation as a preventive measure against a possible terrorist attack on the United States. (Photo by Joe Raedle/Getty Images)