TSA's behavior detection approach is designed to identify and engage individuals who may be high-risk (eg, possess malicious intent) on the basis of an objective process using behavioral indicators and thresholds, and then route them to additional security screening
Indeed. For a while, I was randomly selected for the enhanced security screening every time I would board a flight in the US. I can't be sure what was the objective process used to make the determination, but my guess is that it was a combination of three factors: at the time, I had a crew haircut and a full-face beard, making me look like a muslim to some idiots. I believe the second factor was a flight from Amsterdam to Detroit I took, where I got rerouted through Paris. The TSA guy I had to explain this to clearly took this as a fiendish attempt to evade the then-ongoing paroxism of the wars on stuff, and ended up making copious notes - which undoubtedly went on my file. The final straw was my unfortunate tendency to be polite to older helpless-looking people, which once prompted me to help a very nice old lady in a muslim dress to move her luggage in an area where TSA in their infinite wisdom has barred luggage trolleys. I also chatted to her afterwards for a while, as we were both waiting for a flight.
Bingo.
For the next two years, my every attempt to check in online will fail. Every boarding pass I will get at the airport will have the dreaded "SSSS" security flag. If I were lucky that day, I'd just get an extra security machine or two and a bit of light whole-body massage; if not, it would be into the waiting room for an interview - so after a while I started carring some extra reading material, and allocating extra two hours for clearing the security.
Then, after couple of years of this charade, it just stopped. No doubt TSA paperwork has shown that Yet Another Security Incident was prevented by the clever behaviour-science wizards at TSA.