Once upon a time, I ran an online newspaper. I had some news experience and I was able to hire an honest-to-goodness degreed journalist away from the Waco Tribune. It was a serious operation with standards.They're quite good for detecting the gullible.
One day a city crew had to dig in the street in front of our offices. Everyone was standing around, backhoes at the ready, while one guy walked around with a pair of bent coathangers, witching for the water main.
The city manager was a good friend. I'll never forget the look on his face when I showed him photos.
There was nothing newsworthy. If I had run a feature story I would have been obligated to skewer long held beliefs. The city quietly squashed water witching on paid city time.
There was also a case when the local sheriff's department spent a few thousand on something called a Quadro Tracker, equally as fake as water witching. A ranking deputy tested it on me after I loaded him up with comments about how I shouldn't let him test me for unlawful handgun possession. Sure enough, he bit, he saw a strong hit good enough for an arrest, and then I explained how my guns were locked away from my kids. I hadn't touched one for a year or two.
I didn't have my newspaper then, but I was still going to engage false pretenses. But the FBI beat me to it, shutting down the Quadro Tracker operation.
It's easy to say there's one born every minute. On the other hand, lots of folks who believe in folk hoodoo are just honoring how they were raised. They should still freed from dogma, but gently.