Here’s an interesting article debunking ghost hunters, Ed and Lorraine Warren.
We sought to evaluate the phenomenon of ghosts (in the generic sense, referring to all manner of spiritual manifestations) and see if there was any evidence to support the hypothesis that the phenomenon exists. On the matter of hauntings, the Warrens were one of the preeminent experts, and they were local, so naturally we decided to look into their work. Also, they claim to have scientific evidence which does indeed prove the existence of ghosts, which sounds like a testable claim that we can sink our investigative teeth into.
What we found was a very nice couple, some genuinely sincere people, but absolutely no compelling evidence, or, more precisely, there was a ton of “evidence,” but none of it stands up to rigorous scientific testing, and most of it not even to cursory testing. None of it.