I've read through the FOIA products on the EPIC website. The procurement spec and system requirements documents clearly require the machines to be able to save images during testing. There are requirements for access hierarchy, i.e.: who can place the machine into test mode and that it must be set to operations mode before use on passengers. There is also a training mode in which stored images are projected for the screener to view. So, based on the procurement spec alone, the machines clearly are able to store images.
The "super user" (or whatever the correct term is) can bring the machines in & out of test mode. According to the specs, the FSD can't even do this. So, the sysadmin guy is low enough down on the totem pole to not be in a position to refuse a direct order froma higher-up to place the machine into test mode. If the sysadmin guy is a contractor, he can't refuse a request from any government person if he expects to continue working.
So, the fact that the machines can and will store images is irrefutable. The TSA's response to us is "trust us." That doesn't cut it.