When the TSA has asked my travel party members or me for additional ID, it’s been for different reasons: 1) they didn’t believe the ID was really legitimate and valid for the presenting traveler and perhaps otherwise doubted the identity of the passenger; 2) they weren’t familiar with the ID and wanted something with which they were more familiar; 3) they were lazy and wanted an ID they could more easily scan to work with their computerized feedback from ID scan; 4) other identity confusion; 5) wanted passports for ID because the non-passport ID shown to TSA was presented in conjunction with international flight; and/or 6) they seemed to want to try to just hassle the passenger or maybe even to trigger the passenger into a “suspect” type of behavior.