I really wish that you would read this article, because the person who wrote it (Professor Paul F. Kirgis of St. John’s University Law School) is much more of an expert than I am.
https://papers.ssrn.com/sol3/papers.cfm?abstract_id=1106189
If you would just read the abstract, that would give a much better idea of what I am arguing, or at least trying to.
Abstract: “A fundamental principle of the Anglo-American adjudicative system is that cases must be decided based solely on evidence formally admitted through trial procedures. A jury may not base its decision on information received outside of those formal procedures. Yet jurors bring to the jury room a wealth of education and experience received prior to their service and not subject to the formal rules of proof. That kind of worldly knowledge is a prerequisite to jury service; without a basic level of common knowledge, jurors could not understand the evidence put before them. Problems can arise, however, when jurors bring expertise that exceeds the common knowledge that we expect, and need, them to have. This prospect raises the problem of the expert juror. Especially today, in an evidentiary system remade to require greater scrutiny of expert testimony, courts must be aware of the possibility that jurors will inject unexamined expertise into deliberations, thus subverting the adversarial model of proof we depend on for decisional accuracy and legitimacy. This article examines the problem of juror expertise and suggests an approach for addressing the problem that focuses first on jury selection and second, in extreme cases, on post-verdict review.”
Note the fundamental principle mentioned at the beginning.
Note that jurors need common knowledge, but that is to understand the evidence put before them, not to bring their own evidence.
Note how the author views the possibility that a juror will inject unexamined expertise into deliberations.
I realize that this is a very esoteric topic, but I am not just inventing these concepts on my own out of nowhere. If you can find an article by an expert that says the opposite about the role of juries, I would be happy to read it.
Honestly, I have found this argument quite frustrating. I introduced that article, which lays out the essentials of my argument, around 50 posts ago and repeatedly asked people to refer to it, and yet I have been treated as though I completely invented this whole insane idea about the role of juries on my own out of nowhere. As though nobody has ever thought of or suggested such a thing before. Nobody else has introduced any other scholarly articles to say otherwise. None of us are experts of course, but there HAS been scholarship about the role of juries.