For those who think marijuana is a harmless drug and that “Reefer Madness” is the name of a funny out-of-date movie, consider the case of Bryn Spejcher. She experienced what is called “cannabis-induced psychosis” and stabbed her boyfriend Chad O’Melia 108 times, killing him, then stabbed her dog and was trying to kill herself when the police arrived. She was arrested, prosecuted, and convicted of involuntary manslaughter.