“Oh i beg your pardon, i thought the law was dictated by hard raw evidence and not the guessings of a few would be arm chair pyschologists”
I don’t know if you have much knowledge of criminal trials, Kramer, but your simplistic view is not usually the case. The fact that a defendant has pleaded not guilty usually indicates that he disputes the prosecution’s version of events and he very often puts forward a version of his own. Both of these may be equally plausible, though one is usually closer to the truth than the other and are often accompanied by the “hard raw evidence” you mention. It is the job of the jury (or bench of Magistrates if the trial takes place in the lower court) to determine which of the two versions (i.e. which evidence) they prefer over the other.
It is not only the content of the evidence but the way it is delivered. In a Magistrates Court, the Bench, unlike a jury, has to give reasons in open court for their findings when delivering their verdict. If you listen to such pronouncements you will hear terms such as “we found Mr X’s evidence unconvincing”, or “we found Miss Y to be confident and consistent when giving her evidence”. Those findings are not based on the words alone (or they may as well be read to the court) but also take into consideration demeanour and, yes, body language. The jury are not “experts” in body language or anything else - that’s the very reason they are chosen at random. They are being asked to assess evidence as lay people and believe it or not many people can determine a lot from watching somebody speak or from their reactions to things said by others.
The suggestion that because blind people are permitted to undertake jury duty (and sit as Magistrates) is not sufficient to show that no sight is needed amongst jurors or Magistrates as a whole. If a jury were to be made up of twelve blind people (or a Bench of three Magistrates all be blind) I’m quite sure some objection would be made which would prevent the trial proceeding. It is true that blind people may bring qualities to a panel which sighted people do not possess, but without some element of sight such a panel is unlikely to be effective.