I just got a letter from a dowsing group in Devonshire, which claims that Coghill has validated their practices. They claim an electromagnetic field basis for the idiomotor effect. Leaving Coghill aside, does anyone know of any other relevant and rigorous studies published in reputable scientific journals?
The Devon Dowsers seem intrigued by the Randi Challenge. They don't claim a paranormal effect, just the electromagnetic one. I am struggling to see the distinction. If dowsing can detect something otherwise undetectable, then surely that's paranormal? If there is any electromagnetic field (and in fact there would be either or both of 2 fields of course, one electric and one magnetic), then there are instruments sensitive enough to detect it. For example, various fish navigate using electric fields, and the fields they detect can also be detected by instruments.
So the Devon Dowsers seem to think that Randi is only testing the paranormal, and they are not paranormal so they won't be eligible. I think they are, and they should go for it.