Recently I have been stopped twice at two different airports for some sort of agricultural screening after going through customs with GE.

At EWR, an officer who was standing in the baggage collection area stopped me and asked to see my slip before I made it to the officer who was collecting the slips at the exit. She asked if I had food and I told her I had purchased some chocolates at the duty free at my departing airport. She made a mark on my slip and upon handing that to the officer at the exit I was sent to a secondary screening area where they asked me some questions and scanned my suitcase (but not the bag containing the chocolates I had purchased at the duty free- the officer looked inside that and told me not to put it through the scanner).

More recently at JFK, on my way out, after the GE slip had already been collected, the woman, who was standing in the screening area, motioned for me to go to the screening area as I was heading to the exit (the screening station is right next to the exit). She was more aggressive in her questions, asking not only the usual questions (where I had traveled, why) but also the zip code of my address in NY (multiple times throughout) and how many times I had traveled outside the US in the past year.

Does anyone have any insight on what this is and why I keep getting randomly called over for this screening? In both instances they were not stopping everybody to ask to look at their slip prior to getting in line for the exit (in the case of EWR) or called over to the screening area on their way out (in the case of JFK). Thanks!