But when Andrew Schneider, AOL's public health correspondent, contacted the TSA to find out what maintenance and testing is in place to ensure the safe operation of the scanners, he discovered that the TSA appears to have no regime at all to ensure that they are functioning within normal parameters. While the TSA claims that entities like the FDA, the US Army and Johns Hopkins all regularly inspect their machines, none of these groups agrees, and they all disavow any role in regularly maintaining and testing the TSA's equipment (the Army has tested machines in three airports, but has not conducted any further testing). And Johns Hopkins denies that it has certified the machines as safe for operation in the first place -- let alone taking on any ongoing testing and certification program.