Forty-four years ago today, Pirates right-hander Dock Ellis no-hit the Padres while on LSD. There is no "reportedly" here. Ellis has fully admitted to being high during the game.
In fact, I'll let Ellis recap the whole incident. Here is one of my all-time favorite YouTube videos:
Also outstanding: our theoretical bobblehead of Ellis throwing that no-hitter while on LSD:
Even more outstanding: there is a film about Ellis' life coming out soon. It's entitled No No: A Dockumentary.