I don't have any proof that Jason Sorens is a skull and bones member.
He has never denied being one when asked.
Of course not. Although Boners are allowed to kill hundreds of thousands of people to enhance the financial positions of their buddies, they are never allowed to deny that they are Boners. You never ever see them break that rule.
Normal people, of course, will when asked say "No, I am not now, nor have I ever been, a member of Skull & Bones."
Example: I myself am not a Member, therefore I am free to say it:
I am not now, nor have I ever been, a member of Skull & Bones.Jason and Bush, on the other hand, are Boners and are forbidden by their Secret Rule to deny that fact, and so you will never ever hear either of them say it.