In the long arc of America’s search for the most humane way to execute criminals, lethal injection evolved as the gold standard. So why are Utah and Wyoming lawmakers reconsidering firing squads?

Problems with obtaining drugs for lethal injection, lawsuits over state secrecy surrounding the drugs being used and a botched execution last month in Oklahoma may be diminishing the ­confidence that some lawmakers and judges have expressed in that execution method, some death penalty experts say.