Heroin addiction relapse is so common that it's often considered a part of the recovery process.
But what if there was a way to ensure that someone would never relapse again? Short of destroying all of the world's opiate supplies (which is highly unlikely), how can one ensure an individual would never get high from heroin again?
By vaccination, apparently. The Scripps Research Institute has successfully finished clinical trials on primates, testing vaccinations that could potentially block the "high" people feel from taking heroin.