Worse, like we know lie detectors would work for facts, "Did you do X? Yes/No"

My scenario would involve some startup creating some software that would analyze a brain scan(or worse analyze your internet activity) then it will answer for questions like this"Does this person has potential for being a pedophile? The answer would be something vague like "Strong potential"/ "weak potential" , I chose this example because I noticed that when children are involved you get much more irrational laws and the justice is applyed much stronger with less evidence

But lie detectors don’t work

To be more accurate, they don't work up to the standard we require for legal evidence and, with some practice, can be defeated.