“In controlled tests, dowsing fails every time.”
I have seen a controlled test where a row of about 50, 5 gallon buckets were put in a row. only 3 buckets, all next to each other, were full of water. the rest were empty
A continuous wood plank path was then sat atop all of the buckets so you could walk on the path, and not see into the buckets.
Then they had a parade of guys with their metal rods , one at a time without seeing what the guy before them found, take their time and walk the path looking for water, not one single person found the water.