This is still going on?!
What is the difficulty in admitting that there is probably some explanation for dowsing that we don't know anything about?
It doesn't have to be only well known phenomena such as electricity, magnetism, gravity and such other stuff. It doesn't have to be a con or hoax. Nor does it have to be some known mental phenomenon such as 'subconscious observation of the environment'.
All these are 'comfort' explanations. They keep us within our comfort zone. Why are people scared of lateral thinking and exotic explanations? People are scared that somehow God will be forced down their throat if they are not careful.
The God phobia! Just as scientists have come up with bizarre and exotic explanations such as Dark Matter and Dark Energy to explain certain observations (going against all intuitive and normal explanations)....we also may have to come up with some new explanations, not just for dowsing but for other unexplained phenomena as well. The Biofield is just one such possibility.
It doesn't have to be either a well known 'Scientific' explanation or else 'Woo'.
But that may take a few more generations, I guess.