How is the TSAer able to ascertain the validity a particular piece of ID presented, given that there are thousands of possible forms of ID used in the world? IOW, how does non-expert in document construction distinguish an excellently forged document from a legitimately-obtained and issued one, w/o prior knowledge of the basis for "real" and "fake"? And how does a ID checker determine whether a particular piece of ID was issued under false pretenses, i.e. one that is "fake?"

The distinctions I'm attempting to draw here are twofold: 1) between real and fake documents; and 2) between real and fake identities (the person as themselves vs. pretending to be someone else).

And then even if ID is presented and then if the TSAer cannot ascertain the validity or falsity of the ID, the pax can still get send to secondary? That doesn't seem efficient or fair.