[TangoLimaSierra]

Why not give them “choice”; electric chair, firing squad, lynching or carbon monoxide.

I was just about to say, 'Why not an oxygen mask and a tank of CO?' Cheap, reliable and painless.

[Max in Utah]

Nitrogen is widely available, cheaper, quicker acting than CO, and it’s non-toxic. Strap ‘em down on the gurney, put the mask on and open the valve.

So simple even a liberal could do it (if they would).