Jeez Mushroomized, how pure are they selling them where you are?  If it's anything like over here, they've been cut with leopard or even dolphin by the time they get to the street.  You're lucky if you get one that doesn't have a dorsal fin.

I feel for your loss, but from here it sounds more like your brother likely didn't overdose per se, quite so much as miss when he tried to get the spurs to dig into a vein.  It's difficult to get a decent aim when the little guys are thrashing around that hard in your hands trying to get away.  Sometimes people will get a rogue spur right in the jugular, and then it's game over for real.

I wish you'd consider giving lectures at schools.  You'd be an obvious person to give them, and it's a message a lot of kids need to hear.  When I notice the kids today doing the "duckface" trying to score a little 'pus, I wish they knew better what they were getting into, and that their parents knew the warning signs.