Comment by gwerbin

> All these others syntheses with multiple steps up the chances of weird toxic solvents or contaminants creeping in. I think it’s a contaminant issue that’s exacerbated by the drug use.

The article addresses this:

> Second, the evidence we have is against the idea of contaminants in P2P meth. Almost all meth was produced using P2P since 2012, before most reports of schizophrenia. And P2P meth synthesis has changed several times in the interim, resulting in higher purity than ever before.

Not saying they're right, but the author at least believes this hypothesis is contradicted by the data.