What if they passed all your tests? The fairy example was to point out that there are human experiences that are confirmed by eye witnesses at the time of the experience. Even within the scientific method such a fact has scientific weight as well as in the courtroom. When two people say they saw the same thing, such as a murder, questioners can accurately determine if they are lying or not based on the science of psychology and other factors. More than one person is greater than one person.
That is for the scope of human reality, Sab. You are entering the unproven supernatural. Thousands have claimed to see aliens, and there is yet to be proof. Don't let numbers fool you.