https://www.sott.net/article/264505-From-Monterey-Pop-to-Altamont-Operation-Chaos-the-CIAs-War-against-the-Sixties-Counter-Culture

Brian Jones had a complete personality change after taking LSD.

Janis Joplin's first LSD was administered surreptitiously. When she discovered what happened, she ran to spit it out.

What appears as suicide can be murder. 

One of the Byrds stopped singing at Monterey Pop to question the official Warren Report conclusion that Lee Harvey Oswald was a "lone assassin."