Alabama calls nitrogen execution method 'painless' and 'humane,' but critics raise doubts

Alabama, unless stopped by the courts, intends to strap inmate Kenneth Eugene Smith to a gurney and use a gas mask to replace breathable air with nitrogen, depriving him of oxygen needed to stay alive, on Thursday in the nation’s first execution attempt with the method. The Alabama attorney general's office told federal appeals court judges last week that nitrogen hypoxia is "the most painless and humane method of execution known to man." But what exactly Smith, 58, will feel after the warden switches on the gas is unknown, some...