A fiscal analysis of the Oklahoma bill projects it would cost about $300,000 to build a gas chamber at the Oklahoma State Penitentiary in McAlester. A similar bill is pending in the Oklahoma Senate.
Christian said unlike traditional gas chambers that used drugs like cyanide that caused a buildup of carbon dioxide in the blood, breathing nitrogen would be painless because it leads to hypoxia, a gradual lack of oxygen in the blood, similar to what can happen to pilots at high altitudes.
Under current law in Oklahoma, where lethal injection has been used since 1990, if that method is found to be unconstitutional, the state would use the electric chair. The firing squad would be the third option.
Christian said he is considering amending his bill to eliminate electrocution as a backup method.
The Rev. Adam Leathers, a spokesman for the Oklahoma Coalition to Abolish the Death Penalty, said he wished lawmakers would entertain abolishing the death penalty altogether, rather than spending time developing more efficient ways to kill people.
"It's evidence of what a ludicrous idea this is to begin with," Leathers said. "We're scrambling around trying to figure out humane ways to kill someone.
"There isn't a right way to do the wrong thing."
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House Bill 1879: http://bit.ly/1vetcRn
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Follow Sean Murphy at www.twitter.com/apseanmurphy