They get through legally --- most illegals aren't coming in through the desert -- most of the ones coming to use the hospitals obtain a shopping or visitor pass or medical visa --- and some come to use the hospitals here because they don't have to pay like they would in Mexico and go back after their hospital stay is over. The illegals coming over the desert often are caught a few times until they figure out the system. Then they make it over pretty easily. As long as they do things the right way, they don't get in much trouble for getting caught.