Nitrogen hypoxia has been approved as an execution method by three US states but has never been used. Lawyers for death row inmate Kenneth Smith say he should not be used as a 'test subject' for the new method.
A death row prisoner in Alabama is fighting plans for him to be the first person to be executed using nitrogen gas.
Authorities in Alabama want to execute Kenneth Smith using the method - but the inmate's lawyers say he should not be used as a"test subject". Nitrogen hypoxia has been approved for use in three US states, but has not yet been used in an execution.
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