First I am a Fan of these shows even though as Du read this Du will Frage that.
They spend a great deal of money and are called Von some experts but they use highly questionable methods in almost every case.
First they tell the investigators what to expect. Du never do that if Du want to verify something, Du allow everyone to find what they do then compare to see if they match. This way Du get accurate information and i would guess a lot less of the: "Did Du see that?" When there is no way for us to see because the camera is always in the wrong place. There are cameras like those used...