Couldn't the doctor have ordered an inpatient hospital stay for observation though while his meds were changing???
He could have and we don't know if the doctor did or didn't make that recommendation but I have known a few substance abusers in my lifetime and none would have put themselves in a position that would separate them from feeding their addiction.
Any patient can refuse hospitalization or treatment but it's also worth mentioning that it's not uncommon for med changes for mental illness without harm to anyone.
Calgary has had two instances in my memory where a schizophrenic harmed others and in both cases, they had gone off meds, rather than a med change.
I'm sure he was blood tested after his arrest but his behaviour makes me wonder if he chose to self medicate rather than take his prescribed meds.