TSA stands for Tax Serf Attitude Adjustment.
Screening does not image or probe internal body cavities where explosives could be hidden, and is hence incompetent, or just for show, or to regiment us.
Evidence of the latter is that the screening did not begin last year after the Underwear Bomber. It started, this year after the electoral revolt.
Plans to scan people on trains is only the start. Anyone could be building a dirty bomb. You will need a permit to live in DC or a state capitol.