People on meth can have psychotic episodes and hallucinations. It's a common sight today to find shoeless people high on meth yelling incoherent things in traffic. That's the answer to your experiment. In my city in CA, meth is dirt cheap and enforcement on the side of the police is zero. I've seen a shirtless man smoke crystal meth right outside of the train station with metro security not reacting at all. BMWs appear by night to sell meth and pimp out people from homeless encampments, aid workers appear by day to feed people boxed lunches. That sort of environment doesn't lead to people picking themselves up by the bootstraps and stepping into a job and a $2000 1br apartment (going rate in LA). This situation of nothing checking drug use leads to them falling further and further into psychosis until they die in poor health in a bad situation with a necrotic limb or two, as I've seen play out before my own eyes in this city.