This thread has gone in some interesting directions since I (The OP) shared my situation looking for guidance and information.
Here's some follow up FWIW.
My guess was that the trigger on my carry on was a special lotion I use for my face which contains glycerin.
I braced myself for trouble at screen because I purchased two additional bottles of this lotion while in LA.(Am I asking for trouble????)
Except for being asked to remove my "slipper shoes" I get through screening at LAX with no problem or issue.
So who knows what caused my initial problem at JFK??? I think I can eliminated the lotion -- I've never had a problem at JFK or any other airprt before when I travel with it. -- unless their is now "better" equipment at JFK that is the difference.
Anyway, I'm still unable to ascertain what my personal information was/is needed for, where it is/was being housed , how long, and how it will be disposed...
mapsgl