Here's a step-by-step explainer.
Cracking down on the legal supply is not a solution. In fact, it could spell disaster.
Some advice on how best to support your loved ones.
One $5 or $10 fatal dose could become dozens or even hundreds of nonfatal highs.
"The international drug control system promised a world free of drugs, but has delivered the exact opposite."
"The Sackler family is just as shameless, and only marginally less ruthless, than the drug cartels."
And other science news you may have missed.
Recent reports that smoking heroin (and an associated risk of brain damage) is increasing among young people aren't looking at the full picture.
It's more than quadrupled.
With stressful jobs and easy access to pharmaceutical grade opiates, it's no wonder some doctors get hooked on the drugs they use on their patients.
Public health officials overlooked more than 70,000 opioid-linked deaths from 1999 to 2015, according to the study.
It appears that meth use is back on the rise, and with it a host of health and social problems that are going to become really hard to ignore.