
Deja Vu
While I'm exceptionally well versed in Ideomotor technique (it's been the basis to many of the things I've done on stage, etc.) I also come from a familial situation in which Dowsing is very much a part. I've seen and experienced the difference first hand and sadly, there is no way to "prove it" to the cynically dependent, that such is so... sorry Taffy, but if James Randi could prove the sun was a hoax there are "educated" fools out there that would kiss his wrinkled butt and praise him for such a revelation.
The chief problem with proving Dowsing or any related skill centers on one's ability to not just silence the mind but set aside any (ANY) expectation. This is something the cynics not only can't do, they would refuse to do so even if they could. But we can say the same about the believer to some extent, which is why when they place themselves into a "prove it" scenario, they fail. They are so fixed on the idea and overly confident that they "aren't listening" but rather, trying to second guess things via the logical mind so as to expedite the demonstration and have gloating rights.
The other issue centers on "external" energy or what some call "Telepathic Influence" which also comes as a double-edged factor; the skeptics seeking to test the claim project their doubt and desire to see the dowser fail and so they will
IF the dowser is ultra-sensitive to such an emotional focus. Conversely (and this is very true during the "training" process for dowsing), the believer can misguide the novice by wanting them to succeed and unwittingly influence the tests (even when out of sight... for those that will want to suggest body language tattle-tales).
I have seen and actually had the Y stick pulled from my hands when coming onto certain "flows" (it's most common with fast moving, heavy bodies of underground water). I've likewise had Pendulums, Okimeters and other such "static" devices suddenly go nuts in how they move when over a specific target. So again, I KNOW there's much more to it than mere ideomotor influence BUT... and this is very important to note... the majority of what people do, especially when they are just starting into dowsing, IS ideomotor based discovery. That's not to cosign the claim that it's all one in the same, only that understanding the difference requires time and experience (along with DAILY practice).
"Scientific" qualification for this and most other paranormal or psi type skills will probably never come to be accepted by the status quo simply because those who can't replicate the skill will insist that it's fake and trickery is involved, ignoring the fact that they are missing a particular "ingredient" in the testing -- someone that is a successful dowser vs. a
johnny-come-lately ego wanting to prove himself.