The dark web is providing cover for sales of synthetic opioids, associated with a rising tide of overdoses in the United States and beyond. The Postal Service is a key part of the delivery system.
MINH UONG / THE NEW YORK TIMES

Opioid Dealers Embrace the Dark Web to Send Deadly Drugs by Mail

Anonymous online sales are surging, and people are dying. Despite dozens of arrests, new merchants — many based in Asia — quickly pop up.