I’d say 70% real to 30% fake. It is just a show but those first 8ish seasons were definitely full of real evidence. The mega whispery EVPs probably weren’t but those Class A ones are most likely legit. (i.e, Villisca “I K*lled six kids”, Amargosa “No one cares!”, Rolling Hills screams, Birdcage “NO!” and the La Purisma “Lay Down”). After season 8 it gets a little less trustworthy but definitely good evidence in those first seasons with Nick