I don't see this guy working in IT again
One time mistakes, like a drunken party happen, a wrong course of action consistently held is disqualifying.
Not only should this guy not work in I.T. again, but he shouldn't work in any career that grants him a modicum of trust. Over time he might change his ways, but I'd need to see clear evidence of that before I'd consider hiring him.
Of course, everything is contextual, too.