Just got this quote from a DC area TSO on another forum. (The 6 year old girl pat down made it into a thread, and the local TSO just had to jump in)
The only images that are saved are the ones with detected anomalies on them.
This is basically a "heres why we gave this person additional screening" if something ever comes up.(OIG Investigations)
It's essentially the higher up's CYA mechanism.
Sounds like the images
can be and
are saved.