Well he obviously can't be convicted of hypocrisy before the fact, but I suppose one could say that after he had become addicted and was accused of "doctor shopping" he should have just surrendered himself and gone to jail. Of course no such standard exists for any celebrity on the left, even those who take a nominally anti-drug position.
Everyone knows that public figures from the right are guilty upon accusation, so for Limbaugh to evade justice as he did (hiring a lawyer, defending himself) makes him guilty of hypocrisy from a left-hand point of view.
Everyone also knows that leftist celebrities must never be accused of hypocrisy, regardless of the interesting dichotomies they float on a regular basis. I guess the worst of which they can be accused is "irony."