Baby sitting. 4 year old boy and 11 year old boy (at the time.) It was for a football game and another time for dinner. The point is we trusted him with our children.
If you want to do Salvador a favor, send him back to Mexico and sponsor him for legal immigration. Hundreds of thousands come to this country from Mexico every year. He is skilled. He should have no problem getting legal residence. Then he will have nothing to fear.