First, let me just say Paul has excellent insight into this.
Second, it's story time. Pull up a chair, folks. Bear with me as I put this out there and tie it together. Once upon on time in the way back when of 1974, I dated a guy a bit older than myself who said he was an FBI agent. He acted like, looked like, and had all the "techie" toys of that age....which wasn't a lot but hey, it was impressive for that time. Didn't last long because despite all the top secret/official flash and drama, I just felt he was trying to impress and delude me. Fast forward to about two years ago when I looked him up online. Guess who's in Federal prison for impersonating an FBI agent and child trafficking....I had a young child back then.
My point....there are always pretenders out there and that goes for the paranormal field as well. These are people who have enough info to pull off what looks like real paranormal phenomena, but who actually fake it to control or impress others. They will go so far as to conceal audio devices, etc, to "prove" their abilities. This is not to say there aren't people out there with the real skills, but we have to be mindful of what someone presents to us as "real."