The scanners only have the ability to transmit images when placed into a test mode for diagnostic purposes.
The TSA officer viewing the image cannot see the actual passenger. No cameras, cell phones or other devices capable of capturing an image are allowed in the room where the image is displayed"There is no way for someone in the airport environment to put the machine into the test mode," the official said, adding that test mode can be enabled only in TSA test facilities.Further, the TSA says, the machines are not networked and cannot be hacked.
Body scanners can store, send images, group says - CNN.com
Your myth looks busted to me.