My belief is that they are junk science. There instruments do nothing of significance and prove nothing. Why don't they investigate in the daytime or with the lights on? Because there is nothing there, that's why. All TV shows hype up the pitiful truth to make it entertaining. Even the Discovery Channel, TLC, and History Channel all hype the stories and add to the truth to make the shows exciting. I have written a lot about this in my hubs.