Undeterred by a shortage of drugs used for lethal injections and capital punishment’s waning popularity, states that still practice the death penalty are seeking alternative ways to kill death row inmates. The latest suggestion? Death by nitrogen gas, a method that has never been used before. After several international drug companies decided to stop sending drugs to prisons if they were to be used in executions, state officials began scrambling to find alternatives. Several states have mulled bringing back older methods such as the electric chair or firing squads. Recently, Nebraska and Nevada suggested fentanyl , a powerful opioid responsible for thousands of deaths in the United States. And in the last several months, Oklahoma, Mississippi, and Alabama have authorized nitrogen gas for executions. But there may be a problem. “Nitrogen hypoxia, whatever that might be, is not a medical act,” Dr. Joel Zivot, a professor of anesthesiology at Emory University, told Mother Jon