US man to be put to death months after botched execution attempt

This in the USA ; https://www.theguardian.com/us-news/2024/jan/21/kenneth-smith-alabama-execution-nitrogen-gas



Are  you in the USA  and heard of this??
Seems the first attempt to execute him with a  lethal injection failed as they could not  locate  a vein to use

BUT what is the legality of using this nitrogen gas for this 'purpose'?? Let alone ethical

https://www.theguardian.com/world/2024/jan/24/onex-corp-canada-equipment-alabama-execution



will this   system  be used for this? IS  it a  legal use of the nitrogen gas?

so he has been killed  but seems it did  not happen  as   expected https://news.sky.com/story/kenneth-smith-alabama-murderer-becomes-first-inmate-in-the-world-executed-with-painless-nitrogen-gas-13056269


According to witnesses, the execution took about 22 minutes and Smith appeared to remain conscious for several minutes.