I'm outa here

Come on Roy, why not add "Speak to the hand, Sisterrrr!

No need to stop, no-one is saying anything unreasonable.

And there's no reason to say HA-haaaaaa as if not knowing how many dowsers have been properly tested indicates anything in particular.

I can tell you two things that ARE relevant:

First, if you Google the subject you'll find absolutely oodles of dowsers have been tested, some properly, some not and none have passed a proper one (while some have passed a dodgy one). (George and I have long known that, you may not have). What does that mass of public data stretching back donkeys years tell us? Simply that none has passed a proper test, (not that I've ever found). So that's 0 out of thousands. The fact that there may be millions doesn't change that rather arresting statistic. Maybe the real ones are out there, like you say, but it is looking a tad unlikely given the evidence.

There's a second bit of circumstantial evidence to be considered. Most dowsers are very shy of tests. That's a rather puzzling human trait unless they are aware they might not pass. Skilled jugglers are never shy to demonstrate.