“Sessions’ facts are actually in short supply. The attorney general justified his new charging policy by pointing to rising murder rates and to an overdose crisis fueled by increasing opioid use. In reality, violent crime remains at close to the lowest levels they’ve been in a half-century, and there is no evidence that local, year-to-year fluctuations in particular cities represent a durable nationwide reversal. What’s more, experts have concluded that decades of mass incarceration played little if any role in lowering crime rates. At the same time, the lifesaving benefits from supervised injection sites are grounded in evidence, and experts say that they are urgently needed to confront the opioid overdose crisis.”