Perhaps worthy of a separate thread under Immigration - ...
US security checks at the moment require a thorough but random vetting of passengers travelling internally. Generally speaking the staff are professional and courteous but what has puzzled me is how they select pax for what is called SSSS screening - in other words the full monty.
Seems like other than race, hair colour etc other factors can include beards, spectacles, hard brief cases or lap top bags, any shoes apart from sandals, belt wearing passengers, babies in push chairs.
So I guess if you want to avoid a detailed screening - travel with no hand luggage, barefooted and without a belt or babies in tow