OK, let me try again to explain as the thread and the forum is going to go in all directions if we cant agree what evidence is. Firstly, if evidence does not prove a fact, then I am at a loss to know what exactly it is (that which tends to prove or disprove something; ground for belief; proof. - first dictionary definition I found on the web) To give another example of the misuse of proof, I once challenged a "bible basher" on my doorstep to give me any proof that god existed. She bent down and picked a daisy from my lawn and gave it to me. In her eyes, the very existence of the daisy was proof of God. She had ignored the issue of causation which is pretty essential. I don't think anyone questions the fact that she has disappeared in the same way that I could not argue the fact that the daisy existed. I don't think that the police as struggling to prove that, it's taken for granted by everyone. The theory of abduction is the theory concerning why she has disappeared. So proof of abduction needs to prove the how and the why of her disappearance. In the same way that the lady on my doorstep needs to prove the origin of the daisy and not that existence of the daisy.