Origin
On 27 February 2017, United States Attorney General Jeff Sessions suggested that there is a link between legalized marijuana and violence, and that his conversations with Nebraska Attorney General Douglas Peterson a long-time legalization opponent helped bring this issue to his attention.
Huffington Post:
“I don’t think America is going to be a better place when people of all ages, and particularly young people, are smoking pot,” Sessions said to reporters Monday at the Department of Justice. “I believe it’s an unhealthy practice, and current levels of THC in marijuana are very high compared to what they were a few years ago, and we’re seeing real violence around that.”