File for unemployment and seek new work. I am a retail theft consultant and work with persons on both sides of retail theft issues as well as train Loss Prevention persons. If he left store (you should not have named) against company policy (even if he had valid reason) he can be terminated. In addition if you Google "at will" you will see the company does not need a reason to fire him. I also suspect there might be more to this than hes telling you or he even knows himself