I would expect them to go to jail as any other criminal if caught, and if the court ran by either party allow's bond and they can make it no different than any citizen of the USA. They just run back across to Mexico as has been done thousands of times over the years and you have to rely on the Mexican police to track them down. Seen a neat TV show on the wall deal just a few days ago and how they will get around it. Nice tunnel under the wall in place now. Was 57 foot down a ladder and near a half mile long one house on one side to another on the other. Drugs and People went north, guns went south. They had the entrance on the USA side hid in a room with a portable caged 500 gallon water tank over the opening. Large what look to be 10x10 timbers for braces every few feet with spray foam behind plywood on the walls to keep the tunnel from caving in due to it being built thru sandy soil. Nice lights and ventilation system also. Said they figure it cost 2 million to build but that was nothing to the cartels in Mexico. Look like it was well used.