(Wired) A company that supplies controversial passenger-screening machines for U.S. airports is under suspicion for possibly manipulating tests on privacy software designed to prevent the machines from producing graphic body images.

The Transportation Security Administration sent a letter Nov. 9 to the parent company of Rapiscan, the maker of backscatter machines, requesting information about the testing of the software to determine if there was malfeasance.

The machines use backscatter radiation to detect objects concealed beneath clothes. But after complaints from privacy groups and others that the machines produce graphic images of passenger’s bodies, the government ordered the machines be outfitted with privacy software by June to replace the invasive images with more generic ones that simply show a chalk-like outline of a body.

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