Timothy York knows what works to treat his decades-long opioid addiction: Suboxone, a medication that effectively quiets cravings. In 2019, he was relieved to learn that the federal Bureau of Prisons was starting a program to expand access to Suboxone. He's still waiting. In the meantime, he's been punished for using Suboxone without a prescription. Last year, after York, 46, was caught with the medication, he spent a month in solitary confinement and had his visitor privileges revoked for a year. York is not alone. The Marshall Project spoke to more than 20 people struggling with addictions in federal prison, and they described the dire consequences of being unable to safely access a treatment that Congress has instructed prisons to provide. Some have overdosed. The lack of Suboxone treatment comes amid a rise in drug-related deaths behind bars. A variety of substances are routinely smuggled into prisons and jails through mail, drone drops, visitors or corrections officers and other staff. In the last two decades, federal data shows that fatal overdoses increased by more than 600% inside prisons and more than 200% inside jails. Forty-seven incarcerated people died of overdoses in federal prison from 2019 through 2021. The data does not specify how many of these overdose deaths were caused by opioids and could have been prevented by medications like Suboxone. During the same period, correctional staff administered Narcan " a drug that reverses opioid overdoses " almost 600 times.