[Kevin]

Unless we knew the particular fraternity, we could hardly begin to unravel this. Different groups have different membership criteria and procedures and not all of it gets to be public knowledge. I know that in my undergrad days (well over a decade ago), we once had a parent call HQ on behalf of their son who we had just expelled. It was treated by our HQ as a joke. If your son thinks he's been done wrong, he's an adult, he needs to look into that and be responsible for himself. No respectable international fraternity exists in a universe where we have to answer to the mommies and daddies of actual adults.

Sorry this happened. There's probably a perfectly logical explanation, but you may never know--and you're not really entitled to know.