By Reason of Insanity

The consultant mentions two things when talking about George. He says that now that George is on his medications and no longer acts like a lunatic, he is no longer able to use an insanity defense in his murder case. While becoming stable on medications would make it possible for him to stand trial, his lawyer could still claim he was unable to distinguish the difference between right and wrong at the time of the murder, which would not negate an insanity defense. He also mentioned how the opinion of the insanity defense changed after John Hinkley tried to kill Pres. Reagan in 1981. In Sept. 2016, Hinkley was released from his hospital 35 years after his unsuccessful assassination attempt.

Mark is complaining about the air conditioning in his office and blames it on being an "old hospital". But in Season 4, episode 26, the hospital is destroyed by a mad bomber - so the hospital is relatively new.