Is a firing squad execution more humane than lethal injection?

(NewsNation) — For the first time in 15 years, the United States is putting someone to death using a firing squad.Death row inmate Brad Sigmon is scheduled to be executed in South Carolina on Friday. Sigmon chose a firing squad over lethal injection and electrocution, which are also authorized by the state, citing concerns over the drugs or process used in injections. This undated image provided by the South Carolina Department of Corrections shows Brad Sigmon. (South Carolina De