LOS ANGELES - JUNE 12: A sign warns of radiation danger near a Mobile Vacis unit where shipping containers are X-rayed June 12, 2003 in Los Angeles, California. U.S. Secretary of Homeland Security Tom Ridge today announced new port security initiatives and investments for increased international cooperation, greater use of technology, and funds for port security enhancements. Ridge promised more than $19 million in security grants for the ports of Los Angeles and Long Beach. (Photo by David McNew/Getty Images)
