First I am a fan of these shows even though as tu read this tu will pregunta that.
They spend a great deal of money and are called por some experts but they use highly questionable methods in almost every case.
First they tell the investigators what to expect. tu never do that if tu want to verify something, tu allow everyone to find what they do then compare to see if they match. This way tu get accurate information and i would guess a lot less of the: "Did tu 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...