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The past thirty years have witnessed a revolution in the science of addiction, yet we still rely on outdated methods of treatment. Expensive new programs for managing addiction are also flourishing, but since they are not based in science, they offer little benefit to people who cannot afford to lose money or faith in their recovery.Clarifying the cutting-edge science of addiction for both practitioners and general readers, The Thirteenth Step pairs stories of real patients with explanations of key concepts relating to their illness. A police chief who disappears on the job illustrates the process through which a drug can trigger the brain circuits mediating relapse. One person's effort to find a burrito shack in a foreign city illuminates the reward prediction error signaled by the brain chemical dopamine.