system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5:Why can't vet drugs to put animals down be used for inmates sentenced to death?

It seems that methods of execution for convicted criminals are constantly being debated for whether they cause undue pain or suffering.  However, thousands of times a day, vets put down cats, hamsters, dogs, and other animals (some easily matching humans mass) with a simple shot that we're told causes the animal to just peacefully drift off and never wake up.  Why can't the same drug/s be used for executions?
gpt
So the companies that make these drugs actually don't want them used for executions, to the point where they will refuse to sell them to governments that do. And we use those drugs for lots of things other than executions, so its a really good threat. Government doesn't dare test it.

They literally can't use the drugs to kill people, so they are forced to get creative, you've seen  how well that goes in the news.

Also, in the US, doctors are forbidden from taking part in executions, so now we're talking about doing medical procedures without the benefit of any actual doctors. This is pretty much insult to injury. It's a medical problem, that needs a medical solution, and medical professionals are forbidden from working on it by their professional standards and ethics organization. 

Edit: department of redundancy department.