No document expert will ever tell you that you can detect forgery without looking at the original document.
Every time a digital image is downloaded, open in a program and then saved it can have its properties changed. Digital imageos tell you nothing you can take to court.
Really? Is it not possible to determine a forgery by means not requiring examining the original? You apparently are blowing smoke again. Ask Dan Rather about forged documents being exposed from an internet copy. Sighted Obot Sank Same.