but it didn't occur to me that it was illegal for him to take the pills because he prescribed them himself
well, it only occured to me that he's actually stealing them, because of the Tritter arc. I mean a doctor is not supposed to write himself prescriptions(we learned that lesson well). Which means, he must have written that prescription for the hypochondriac-guy and then HE took the pills himself and gave hypo-guy the candys. ergo: he stole them.