The driver is probably a Phoenix local. He picked this bunch up in Ash Canyon a couple of miles north of the border. His job was just to move them the two hundred miles to Phoenix and into a stash house.
Then it might be easier to catch him -- although he may have fled into Mexico by now but if he's been living on the USA side, then likely they can find information on him --- who he was working for --- and the company that recruited this load of illegals --- and all should be made to pay heavily for their involvement in this kind of crime and destruction.