Which group of people might not be fully autonomous in choosing to be a research subject?

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psychopaths, for certain. I suspect some mental deviants might not be autonomous either, such as bipolar folks, schizophrenia, and those who experience periodically Borderline personality disorders. https://www.medicalnewstoday.com/articles/9670.php
Some folks who are living lives full of stress are often living outside their internal moral compass