I mean come on, the show is fake and their so called evidence would prove nothing in court, The only thing this show is good for is a few laughs as you see their reactions of supposed ghosts. And the other thing it's good for is seeing locations that you likely never would visit. The only reason to film at night and have all the lights off is to make it more spooky. Plus the add some spooky music to make it seem more exciting than it really is. Most of the show is just them walking around in the dark filming with night vision cameras looking for some paranormal activity. And most of this evidence is composed of some easily faked audio evidence. Most of this audio is just static but they say they hear voices. The video evidence is also nothing spectacular. Again easily faked or subjective.
But if you're looking for anything serious or profound regarding paranormal then I would look elsewhere.