There have been multiple reports of a man in a mask 'letting off gas' on Metrolink trams in Manchester in recent days, the ...

Under the protocol, the subject is strapped to a gurney, forced to breathe pure nitrogen gas through a mask placed on their face, depriving them of oxygen.

Officials say Louisiana’s execution protocol is nearly identical to Alabama, where an inmate is strapped to a gurney and forced to breathe pure nitrogen gas through a mask placed on their face ...