This whole question of whether the dude would have been screened out by BU if they had a better admissions process is ridiculous.
How many pre-meds end up committing suicide? A lot. How many doctors end up with drug problems? Even more.
Did whatever med school fail to properly screen these people? What do you want to do? Psych evals on every applicant? And even if you did, how many people could lie their way though that?
All I'm saying is that it's impossible, regardless of screening or background checks, to make the medical community immune to drug dealers, takers, murders, rapists, and people who go 66 in a 65, because that's illegal, too.
Med school, is a microcosm of society - although a skewed one, live with it.