Oh, give me a break!
For an example of credulity and clever marketing we need look no further than the case of the Quadro QRS 250G Detector and the Psi-Tronics Super-Sensor Dowsing Rod.
This pair of quasi-spiritual detection units fooled people into parting with thousands of taxpayer dollars, based on no laboratory evidence of their efficacy whatsoever. A company called DK Labs are selling similar snake oil devices, which have all been showered with testimonials.
It's a depressing vista. And we wonder why the Garda sub-aqua unit takes instructions from psychics.