Doctors and pharmacists make critical decisions every day about whether to dispense opioids that alleviate pain but fuel addiction. Faced with a drug crisis that has already claimed more than a million lives, legislatures, courts, and policymakers have enlisted the help of technology in the hopes of curtailing prescriptions and preventing deaths. This book reveals how this “Trojan horse” technology embeds the logics of surveillance in the practice of medicine, forcing care providers to police their patients while undermining public trust and doing untold damage to those at risk.