Actually now that I think about it, it’s kind of interesting.
There probably is a form of animal testing in the Monster World. They most probably have medical care so it’s kind of a given that they have it or at least once had it (say they’ve advanced in that area to where people here are working towards now- to make it completely unnecessary to test on animals in the future for medical care, since that’s what people here are doing any rate.)
Of course, given the fact humans are thought to be toxic, it’s illegal to even bring a child in there- even accidentally doing so has Mike and Sulley really fearing for themselves legally speaking. So… there’s no labs in any case in the monster world which have humans.
Now. Waternoose is smart. He can be impatient but you can’t deny his intelligence. He probably knows this. There are no humans being bred in some lab somewhere in the Monster World. There’s no legal means by which to test this idea of the scream extractor. Yet.
Now, if procedure is even anything like how it is where I am testing on animals is a tricky thing, even when you know, the species itself is legally in a lab and allowed to be tested on. I think a lot of people might think that if you have a science degree, OR at the very least a PHd/ studying for a pHd you can just go in any lab and do what you want there.
But that couldn’t be further from the truth. (At least not in the UK). It’s still not perfect- but they’re getting much better in this area and changes are being proposed in some cases. (Though honestly I am totally behind banning it in the case of cosmetics in any case these days… there’s no point to it, heck there wasn’t back then).
First off you as an individual have to go through a series of training and tests. This includes basic animal care and well, making sure you’re not the type of person to make animals nervous. Also that you know the basic procedures and whatever and I think you also have to prove you know procedure and anatomy training (the basics involve rats I think)
And even after this you’re not free to do whatever you want. It can take months, and you have to obviously justify your actual project (as well of course the lab having had to be certified and having the basic facilities necessary). This also includes the number of say individual animals you use- you have to justify that number as being necessary. If scientific meaning can be gained from less individuals then… yeah you’re going to get that lower number of animals instead. Go cry a river. You’re not going to get anymore individual animals than is strictly necessary.
Even through legal means… it takes a lot of time sometimes to get from actually having an idea to actually being granted permission at all.
And tiny slip ups can even mean your ass is theirs. I think there are still some things they need to tighten up but overall- it’s really not a case of putting on a white lab coat and going on your merry way.
And humans? They’re clearly not even legal to have breathing the same air space as non-scarer monsters for very long let alone be in a lab somewhere.
If Waternoose proposes the scream extractor idea now, well people aren’t possibly desperate enough yet to agree. Plus there’s the risk factor involved in it not working and him looking like a fool rather than a ‘hero’ if he does have it made and then goes through the testing process then publically (though the extra fake tests would be unethical themselves by that stage even in the case of animals, but still). Also if he tries to work the system, try to make human testing legal… that will draw suspiscion on him when he (inevitably) decides to go down the illegal route if theings don’t go his way or things take too long for his liking- we see he certanly has limits to his patience (though who doesn’t I guess)- he’s probably looked into this, or had someone look into this regarding the idea of how long it would take to be made legal (if at all). Waternoose is clever, he’s probably accounted for this sort of thing. He didn’t draw the suspicions of the CDA for instance so…
In the end the illegal route was the one he went down with Randall which I guess seemed the most tantilising option for now other than doing nothing. I think the thing is, since this is a prototype, Boo wouldn’t have even have been the only child to get tested. There’d at least be a couple more kids tested on later on in case it was a fluke or whatever. Waternoose would make sure things were accounted for. Maybe even say he can ‘deal’ with the ‘toxicity’ in some form which is absoultly safe. Like a placebo effect- telling them toxicity can be removed in some form or they’ll be safe somehow by keeping them locked up. (Honestly is some of the ‘symptoms’ of toxicity from stress or fear or what when humans come into the picture in their modern times at least? The mind can do crazy things to the body after all).
Then he’d wait a little while and public hysteria would mean he could produce the machine and pretend it hasn’t been tested yet (but it has), they go through ‘trials’ when public opinion has shifted enough and well. Yeah. He’s a hero now in their eyes.
Mass amounts of very young human children taken from their beds in the beginning. Breeding programmes. Waternoose dies an even richer and more powerful man having kick started this sick ’ revolution’ using Randall and Fungus as grunts for the prototypes engineering work, with many monsters being unaware that what they’re doing is indeed as sick and wrong as it is- and he might be long gone by the time Monsters even discover the truth about humans. In any case, Waternoose leaves behind a legacy and he and both the company will be remembered forever.
Whether history would judge him honestly in that senario is neither here nor there. He’d be gone by then probably if he ever would have been in such a senario- in the senario where the CDA wasn’t suspicious to begin with, Mike did his paperwork, Sulley never found Boo and the test went as planned and was successful. It’s questionable if Waternoose knew the truth beyond humans not being toxic.
Like I said, it’s obviously just as well that DIDN’T happen, but it so easily could have in that in-universe senario. (I mean after all I doubt Pixar in terms of creator intent would literally go down that road as an alternate take, but in terms of in-universe senarios it seems frighteningly plausible).