It amazes me that the security at domestic airport are more stringent than at the Southern border.
You have to show ID, take off your shoes, be clear of all metal and certain amount of liquids, etc etc
But at the Southern border, you can bring weapons, drugs, etc etc and be a terrorist, criminals, etc etc and you'll get in free with housing, medical care and prepare Visa card to use and have form to fly anywhere in the US for free.