That guy was selling fentanyl-laced oxy. I’m asking about something along the lines of the likelihood that one of my rich bro friends gets killed by his regular coke dealer.

Depends how desperate your bro's regular coke dealer or his dealer gets. I've heard first hand tales of dealers ending up with bricks of straight filler, like no coke, and passing it off to their customers, even high end ones, because if they didn't they'd be out a whole bunch of money.

Also another second hand anecdote, most coke you buy in America or Canada is probably not pure. Even when getting supposedly pure coke. I've heard what they have in south america and mexico in certain places is nothing like what they have up here.

No speediness, you can sleep, no cravings or come down.