Elon Musk's reported use of psychedelic drugs, including LSD, ketamine, and magic mushrooms, has raised concerns among board members at Tesla and SpaceX. Musk's occasional outbursts and temperamental behavior, described as "demon mode" in Walter Isaacson's biography, have been attributed to his intense work schedule and minimal sleep. His coherence has also been questioned, with executives claiming he slurred and rambled during a SpaceX event. Musk's use of marijuana on the Joe Rogan Show and his alleged drug use at private parties have resulted in Nasa raising concerns and random drug tests for SpaceX personnel.