As I mentioned elsewhere, I was heavily involved in that incident for a couple months after it happened and I looked for causes that could help with the defense. AFAICT No drugs were taken in the days leading up to the mental health episode or arrest (or people who took drugs with him lied about it).

IIRC the one case of jail time also had a substantial interaction with Michael relatively shortly before the psychotic break occurred

I was pretty involved in that case after the arrest and for several months after and spoke to MV about it, and AFAICT that person and Michael Vassar only met maybe once casually. I think he did spend a lot of time with others in MV's clique though.