I don't think Hagrid was expelled for Moaning Myrtles' death or for anything to do with her death. If he had been held responsible they would have put him in Azkaban not just expel him. I think that he was expelled for keeping an illegal pet/ Aragog. This would have been the only charge they could have got him on if their legal system is anything like ours is supposed to be: Innocent until proven guilty. I think the then headmaster and the Ministry thought that Aragog had done Myrtle in but I reckon Dumb. came to Hagrid's defence and pointed out that it was cirrcumstancial evidence against Hagrid. I'm sure the powers that be/ were, wanted Hagrid plopped in prison but an expolsion was the best they could get. Therefore, 'cause he wasn't charged, just suspected, of Myrtle's death, there's no reinstatement of wand to be made.

Even if I'm wrong , *sarcastic, condesending gaffaw* even in the minds of his critics Hagrid was only guilty of allowing a monster into the castle not physically killing Myrtle himself. The old 'I own a pit-bull who rips someone's throat out but it's in their nature; it's not my fault' defence.

What kind of legal system do they have? No lawyers?