Just remember, in employment at will, you can terminate anyone for no reason at all, as long as it's not for the wrong reason (race, age, gender, national origin, religion, etc.) So, you wanna can someone, then you certainly can; you don't have to have a reason. And let's face it - this is how many companies in the past have managed to get rid of gay people that they don't want in their employ, and there's nothing to protect them from this practice as they are not a protected class, just as our drunken friend in this example is not a protected class.
But you certainly cannot falsify an employment verification as that action may put you, and the company, at some risk, and it's just not worth your job when it comes right down to it.