I think it's not possible to do ethically or practically, because only some sorts of people will willingly subject themselves to the testing, examination and pr

I think it's not possible to do ethically or practically, because only some sorts of people will willingly subject themselves to the testing, examination and prodding of of social sciences, even when bribed. And if you tried to force it on them using a government, which would be unethical, you still have the practical problem of the data you get from people under duress being garbage.