It was a machine. I think the other posters may have already described configuring it for plausiable deniability. It was no secret that this was a possibility, my relative told me and several others about a week before he finally used the opportunity. The end was good - as much as you can call dying of cancer good. It was indescribably hard to see him die, but it was even harder to see him suffer in agony being slowly eaten from inside by this terrible disease. I cried then and I cry now but more time would only have meant more suffering. I can't even call it a suicide. It had nothing to do with suicide, he didn't want to die. He wanted to stop the pain and there was no other way. Ending his life was the final pain relief.

But suicide is sometimes that - no other way to stop the pain.

> Is this like a syringe or a machine? I thought those machines would limit the output

Isn't it amazing that in trying to make sure nothing bad happens we make it impossible for good things to happen?

Well, don't take that too far; if there weren't a limiter, the probability for accidental malpractice would be very high indeed (especially since the requester button is often in the hands of a medically-untrained patient).

But it's good to know the limiter can be disabled when that is deemed necessary.

It probably varies, but I would guess that there is a lot of leeway, particularly in machines for hospitals, and they can likely be configured to only reject dosage levels grossly above the maximum feasible for any weight without jeopardizing the plausible deniability the doctors want.

Must be something the staff can adjust. I had a morphine button once, and they told me it was impossible to overdose on it. Wasn't worth it over a knee operation!

I'd imagine it's something like this; https://en.wikipedia.org/wiki/Syringe_driver