I really don't see how that's possible.For example in the hospital or an ER they have a pain scale.They ask you"on a scale of 1-10 with 1 being no pain and 10 being the worst pain you've ever had ,how would you rate this pain?"
That will be subjective and depend on each persons life experience with pain,their own pain tolerance or threshhold and then a sort of guess as to where they think it is.
What each person believes is beyond a reasonable doubt will depend on thier own life experiences,education and threshhold of what is reasonable.Mine is obviously different from yours,so how can you quantify it?
You brought up education as a factor in another post.I agree ,from my own families experience,the two who went to Harvard [one is a lawyer for a watchdog group and one is VP of a computer company]tend to be more analytical in discussions.They analyze each "thing",but don't see the big picture the rest of us [lowly undergrads]see.They can't see the forest for the trees ,so to speak.They are also more socially inept.They would be more likely on a jury to get stuck on a phrase or a word used.
Even DNA is not 100 percent ,but is frequently used incourt as proof of a crime,or as proof of parentage.