The Transportation Security Administration has already conducted background checks on the 2.7 million hazmat drivers, based on their names, to find out if any of them presented a potential terrorist threat. From May 31, drivers who want to renew or transfer hazmat licenses will have to undergo a background check based on their fingerprints. The USA Patriot Act demands states can no longer issue, renew or transfer hazmat licenses unless the TSA has assessed whether the drivers are security risks.