By Liam Buckler Kenneth Smith, a 58 year old convicted murderer on Alabama’s death row, is set to face the death penalty in a controversial “human experiment”. His lawyers’ last-ditch attempt to halt the “cruel” execution has failed. Smith was due to be executed by lethal injection in 2022, but it was called off at the last minute when authorities couldn’t connect an IV line before the midnight deadline. Now, Alabama plans to put an industrial-type respirator mask over Smith’s face and replace his breathing air with pure nitrogen gas, causing him to die from lack of oxygen. This method has bee…