From the moment they are arrested, people with an addiction to heroin and prescription painkillers and those who are taking medications to beat their addictions face the prospect of painful opioid withdrawal. At least a quarter of the people in U.S. prisons and jails are addicted to opioids. Those who are released rejoin their communities with dangerously reduced tolerance and nothing to blunt their drug cravings, making them highly susceptible to a deadly overdose.But new scientific evidence and a recently announced federal investigation may soften prison officials’ long-held opposition to medication-assisted treatment. Rhode Island is the only state that provides all three FDA-approved addiction medications, methadone, buprenorphine and a long-acting, injectable form of naltrexone known as Vivitrol, to all inmates. A recent study in the medical journal JAMA Psychiatry found that opioid overdose deaths dropped by nearly two-thirds among recently incarcerated people in the first year of a new program that screens and provides addiction medicines to all state inmates.