Class A being drugs that pose a "very high risk of harm". Which, you know, if I could post comments on our legislation, I'd be adding a bunch of "[citation needed]"s in that list of substances that apparently have a very high risk of harm.
And like other jurisdictions, there's some real bloody oddities in the law in this area.
E.g., a man was charged for importing 18kg of DMT when he ordered 18kg of Mimosa tenuiflora root bark online, as the bark isn't explicitly handled in law as a prohibited plant like Coca leaf (class C, far lower severity of sentencing) and Papaver somniferum (class B), so it falls through to the default of "any substance containing a class A controlled substance is also class A".
So he could get life in prison, like he imported 18kg of fentanyl.
Hopefully the sentencing judge is reasonable, but the fact that he's facing the same penalty for 18kg of bark that contains about 1 - 2% DMT as you would for importing enough fentanyl to kill 9 million people shows that our law is a bit of an ass.