The shooter was also a pothead.
Many people who have a predisposition to schizophrenia will function normally until they get exposed to marijuana which then triggers a psychotic break. Many of the mumbling schizophrenics on the street would not be there if they didn’t use pot. It is a trigger in those susceptible to it.
Leftist pothead paranoid schizophrenic is a diagnosis supported by the reported symptoms.
Well, no. Stimulants cause psychotic breaks as you describe. However, someone who uses pot may also use crack or meth. I hope they did a tox screen right away.