Commissario
No he had an amount that can be lethal."under the influence" - He had a lethal amount of fentanyl in his system, let's not sugar coat it. And it is possible to put your knee on someone's neck and not kill them.
Look up what is considered a "lethal dose" for many drugs, IIRC the term usually used is LD50, the point at which a substance is lethal for 50% of the population (or LD90 which is 90%).
The lethal amount differs from person to person, and if you've taken that sort of drug you tend to build up a tolerance for it - in much the same way a teenager who has a couple of cans of cider might be rolling drunk, whilst an alcoholic might drink a bottle of whisky and seem fairly sober* and may be able to still do quite complex tasks as you're used to the level of alcohol in your system and used to doing those tasks (but may run into issues if something unexpected happens).
With opioids this is one of the reasons people move onto ever higher doses (often in the US after getting hooked on prescription pain killers), as you can find the effectiveness of them drops so you need a higher and higher dose.
It's also why whenever they put you under for an operation they have a very highly trained, and specialised person to manage the drugs they use, as at one end of the curve you have people who might die from a fraction of the "normal" amount of any medication**, and at the other end you have people who need a lot more.
However it doesn't take a highly trained specialist to realise that when someone stops breathing and you can't find a pulse you should probably stop applying pressure to the neck - what to do when you cannot find a pulse is extremely basic first aid that is taught to the likes of scouts (IIRC beavers teach it and they're about 8 years old!).
*I believe it's where you get the term "functional alcoholic", and the same thing has been observed in many other drugs including cocaine etc as long as the person has the money to be able to buy it.
**Younger brother had an extremely rare reaction to a very low dose of one medication, apparently only one person in the hospital had ever seen it in person before, and then at some massively higher dosage and it was such a rare reaction they only had something like 2 doses of the antidote in the entire complex as they only carried it as an extreme precaution.
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