If the man had been accepted as an expert in a murder trail, involving computer imaging of gunshot wounds, that would or would not be sufficient???
You're baiting, Robert. Fallacy of converting the conditional. No, you don't get to beg the question conditionally of Wilson's expertise.
According to claims made by and about Wilson, he has testified as a computer image analysis expert in court. The existence and nature of that testimony is entirely unknown. This is why I ask for the identity of the case. As I told you before, and as I'm telling you again now, being able to examine the record of those cases would allow us to evaluate whether Wilson indeed testified, what the nature of the testimony was, and specifically whether Wilson's method was evaluated therein according to the customary rules of evidence discussing alleged scientific methods. Wouldn't that have been what Wilson intended?
You keep using the word "accepted as a expert." I don't think you know what you mean by that because you're just parroting what someone else has said.
One can testify as an expert by deposition, as an
amicus of the court, or as oral testimony. Depositions simply provide background; if the opposing party does not object, the expert's deposition is simply entered into the record and there's no
voir dire or oral examination.
Amicus testimony can be expert, but does not necessarily have to weigh any of the facts at trial. Oral expert testimony is subject to
voir dire, but
voir dire doesn't always occur.
Examine, for instance,
Perry v. Schwarzenegger for how expert witnesses are handled. The plaintiffs produced a number of witnesses who were well qualified in their field and whose expertise was not challenged by the defendants (although their
testimony was challenged). The defendants produced one expert witness, David Blankenship, whom they styled as an expert. The plaintiffs exercised their right to
voir dire and challenged his competence to testify as an expert. The court ruled that Blankenship could testify, but in its findings completely disregarded Blankenship's testimony on the grounds that it was not expert testimony. Why? Because his oral testimony itself (after having been "accepted") was shown by direct and cross examination not to have any relevance or acceptance in the field. That is, Blankenship's expertise was impeached not on
voir dire, but by cross examination.
So that's why we must examine the record of Wilson's alleged testimony in those cases. To answer your question more simply, no -- one does not
automatically receive a validation of one's allegedly expert method simply by being "accepted" as a witness. You're fishing for a concession along those lines, so stop.
Epistemologically here's now this works. If you cannot substantiate his claim to have testified, then that part of his claim to expertise is simply dead in the water. If, on the other hand, you can, then he
may be considered an expert on that basis, depending on the nature of his testimony and how it was handled by the opposing party.
Then there's still the matter of the relevance of that testimony to what he did with the Kennedy photos. If, for example, he did something different with the Kennedy photos than he did at those other trials, or in other cases, then a validation of method in those cases would be immaterial to the Kennedy findings. In all cases we need to know what he said at those trials to know whether it applies and constitutes a significant establishment of expertise.
No free ride here, Robert. Either show us where he testified or drop the matter.