Unanticipated effects of poor policy and overreaction.

"In the aftermath of the Civil War a savage drug addiction ran rampant among wounded veterans who had received a powerful medication in field hospitals; so the urban legend goes anyway. But in 1874 a British chemist was hard at work on a new substance that would rescue victims from the curse of soldiers disease, AKA morphine addiction." - DarkSyde of Daily Kos

My Hero Diacetylmorphine