I can understand why they would expel students, although I don't think it is the right approach.
As adults, we need to stop giving kids free passes because we did shyt as a kid. I remember being 16, I remember smoking weed, and I remember it being seen as taboo. Taboo in the sense that you knew you shouldn't get caught doing it.
Expelling the kids and getting the police involved is some cac shyt. Not need to try and ruin lives when the reason for getting pissed off should be concern over their development.
We should however go back to an understanding that substance abuse will not be tolerated so it is not normalised in their mind.
I look at some of my younger cousins and it saddens me. Weed is like water to then.