Is Mariwana a Cause of Psychosis?

This one is from the wall street journal and is titled, canamus in the violent crime search? Oh no. This piece makes the argument that weed is more potent and is linked to psychosis an violent behavior. Here is an abridged quote, the valdi shooter fits a patter. Mass shooters at gabby gifford's beating afrora colorado polls were all reported to be mariwana users. It could be a coincidence, but increasing evidence suggests a connection.