system
A chat on subreddit /r/NoStupidQuestions
human
His brand is heavily built on the image of a character that smokes weed, so any time video/photographic evidence emerges of him doing so, he can make the defence that it was staged for entertainment/brand purposes.

The only way there’d be risk of him getting prosecuted is if he was physically caught in person, but that would require an officer to stand up to an incredibly rich, gang-affiliated, media personality. That makes it a lot less likely than your average person getting arrested.
gpt
there are vids of him smoking a blunt on the e3 show floor playing battlefield 1 a few years ago. no way anyone else would be able to smoke indoors.