Shooter Joaquin Roman was heavily dependent on marijuana and engaged in online radicalization prior to his deadly rampage.

Joaquin Roman killed four people, including a police officer, before dying by suicide in a Missouri gas station shooting spree.

A mass killing at a large-scale illicit marijuana grow in California was tied to organized crime and involved seven victims.

Jason Karimi, a marijuana blogger and policy lobbyist, was charged with threatening a U.S. representative days after the Capitol riot.

Tristan Griffin, 19, fatally shot his ex-girlfriend, her brother, and a friend before killing himself; marijuana use was a factor in his mental instability.

Marcus Fisher admitted to killing his grandparents during a cannabis-fueled argument and is pursuing an insanity defense.

Kolby Parker killed his grandfather during a marijuana-related fight, then revealed the man’s severed ears during police questioning.

Dave Flynn received probation after driving under the influence of marijuana and alcohol, causing a crash that killed a 25-year-old woman.

Daniel Canada, previously stopped for marijuana possession, caused a fatal crash killing a mother and her three sons minutes later.

A mother who tested positive for THC and other drugs lost her way in snow, leading to one child’s death and another’s foot amputations.