The only difference between the Cocktail is Most likely that its more refined and with modern drugs so that There arent any as visible Side effects as There were for Hitler.

Most of them arent Used anymore and are in the south. I dont know the exact Locations but i think Arizona was one, new Mexico, california Had one as well.

They were mostly Used in the 60s and 70s i think.

I mean There were and still are multiple Gas Chambers all around the US that we're Used for executions. So the US is advocating for Gas Chambers.

Yeah but Fentanyl od would probably be good for the executed Person but jarring for the executioner and their families. And over time we learned that execution methods only need to Look good to the executioner so they can do it indefinitely instead of abolishing the death Penalty