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A gas chamber is an apparatus for killing humans or animals with gas, consisting of a sealed chamber into which a poisonous or asphyxiant gas is introduced. The most commonly used poisonous agent is hydrogen cyanide; carbon dioxide and carbon monoxide have also been used. Gas chambers were used as a method of execution for condemned prisoners in the United States beginning in the 1920s and continues to be a legal execution method in three states.〔http://www.deathpenaltyinfo.org/methods-execution〕 During the Holocaust, large-scale gas chambers designed for mass killing were used by Nazi Germany as part of their genocide program, and also by the Independent State of Croatia at the Jasenovac concentration camp.〔Many sources including http://www.yadvashem.org〕 The use of gas chambers in North Korea has also been reported.〔.〕 ==United States== Gas chambers have been used for capital punishment in the United States to execute death row inmates. The first person to be executed in the United States by lethal gas was Gee Jon, on February 8, 1924. An unsuccessful attempt to pump poison gas directly into his cell at Nevada State Prison led to the development of the first makeshift gas chamber to carry out Gee's death sentence. On December 3, 1948, Miran Thompson and Sam Shockley were executed in the gas chamber at San Quentin State Prison for their role in the Battle of Alcatraz. In 1957, Burton Abbott was executed as the governor of California, Goodwin J. Knight, was on the telephone to stay the execution. Since the restoration of the death penalty in the United States in 1976, eleven executions by gas chamber have been conducted. By the 1980s, reports of suffering during gas chamber executions had led to controversy over the use of this method. At the September 2, 1983, execution of Jimmy Lee Gray in Mississippi, officials cleared the viewing room after eight minutes while Gray was still alive and gasping for air. The decision to clear the room while he was still alive was criticized by his attorney. David Bruck, an attorney specializing in death penalty cases, said, "Jimmy Lee Gray died banging his head against a steel pole in the gas chamber while reporters counted his moans." During the April 6, 1992, execution of Donald Harding in Arizona, it took 11 minutes for death to occur. The prison warden stated that he would quit if required to conduct another gas chamber execution.〔.〕 Following Harding's execution, Arizona voted that all persons condemned after November 1992 would be executed by lethal injection.〔 Following the execution of Robert Alton Harris, a federal court declared that "execution by lethal gas under the California protocol is unconstitutionally cruel and unusual." By the late 20th century, most states had switched to methods considered to be more humane, such as lethal injection. California's gas chamber at San Quentin State Prison was converted to an execution chamber for lethal injection. As of 2010, the last person to be executed in the gas chamber was German national Walter LaGrand, sentenced to death before 1992, who was executed in Arizona on March 3, 1999. The U.S. Court of Appeals for the Ninth Circuit had ruled that he could not be executed by gas chamber, but the decision was overturned by the U.S. Supreme Court.〔 The gas chamber was formerly used in Colorado, Nevada, New Mexico, North Carolina and Oregon. Six states, Arizona, California, Maryland, Mississippi, Missouri and Wyoming, authorize lethal gas if lethal injection cannot be administered, the condemned committed their crime before a certain date, or the condemned chooses to die in the gas chamber. In October 2010, New York governor David Paterson signed a bill rendering gas chambers illegal for use by humane societies and other animal shelters.〔(【引用サイトリンク】title= Agriculture and Markets Law § 374 )〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「gas chamber」の詳細全文を読む スポンサード リンク
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