Making it lawful runs the " risk of normalising" the drug that is the first step down a slippery slope for many people, reckons Xochitl Mejia of Tonalli, a centre that treats addicts in the capital.
He brought an accomplice-a random junkie he recruited to stand inside the door as backup so he could jump up and over the counter and not worry about his back.
Most people think that only addicts and illegal drug users can overdose on opiates or opioids, and it is true that most people who are addicted suffer the most overdoses.
Since many former drug abusers have psychological problems, they often need support groups where they can talk about their strugles and find new ways to manage in the world.