But our(The Daily Mirror's) investigation reveals how the programme uses careful editing to mislead viewers and, on at least one occasion, has even lied about the location of filming.
Ciaran, a lecturer in the paranormal at Liverpool's Hope University, knows speaking out will probably put an end to his media career... but he believes viewers should know the truth.
He says: "I think it's time to open the dialogue about what I've experienced on Most Haunted. There have been many incidents with the medium that have been brushed under the carpet.
"I was put in the show to give a professional slant to it, to give it an element of credibility, but the sceptical argument is just swept away.
"In my opinion, we're not dealing with genuine mediumship."
He says he isn't the only member of the crew who feels viewers are being cheated.
"Other crew members have been irked by Derek and what's going on, because it turns what should be a serious investigation into a laughing matter."
And our exclusive footage shows other members of the team occasionally forget they are on camera.
One of our clips, later edited out, shows Karl push an unwitting sound man in the dark and pretend it was a poltergeist attack.
In the remaining footage he says (after surreptitiously hitting the soundman): "S**t, did you feel that?"
Yvette: Are you all right? What's happened?
Karl: I felt something touch me on my shoulder.
Soundman: I felt something hit me.
And in another edited clip with medium Ian Lawman, Yvette is seen on camera making a deep sigh. In the scene that eventually went to air, Ian (after Yvette sighs) says: "What's that noise?
Yvette: What noise? Like a moan?
Ian: Breathing or something.
Yvette: I heard like an 'arrggh'.
On the next shoot at Prideaux Place, Cornwall, Series 06 Episode 04 Ciaran made up another fictional character, highwayman Rik Eedles - an anagram of Derek Lies. Sure enough, Derek made contact with the dead outlaw.
Ciaran says: "In my professional opinion we're not dealing with a genuine medium.
"When Derek is possessed he is doing it consciously - all we are seeing is showmanship and dramatics."
Ciaran went a step further at Craigievar Castle, near Aberdeen.
"I made up stories about Richard the Lionheart, a witch, and Richard's apparition appearing to walk through a wardrobe - the lion, the witch and the wardrobe!"
True to form, Derek mentioned all Ciaran's stories - even though Richard I reigned 500 years BEFORE Craigievar Castle was built.
The final straw came last month when Most Haunted presented a three-night special from Manchester.
On the second evening, the show claimed to be broadcasting live from the site of Cheadle's Victorian asylum, a place where - according to presenter David Bull - thousands died in torment. In fact they were in the derelict remains of Barnes Convalescence Home - where nobody died in torment.
Ciaran remembers: "Derek was communicating with spirits that sounded as if they'd been in an asylum, but it was never an asylum."
Yesterday the Mirror confronted Derek Acorah with Ciaran's allegations. He told us:
"I've worked with Ciaran for many shows and he's got every right to say what he says.
"However, it does shock and surprise me. Not only do I believe that I am a genuine medium - I live my work 24 hours a day. If I thought that I wasn't a true medium, I wouldn't work as one."
A spokesman for LivingTV said: "Ciaran O'Keeffe has worked as the programme's official sceptic for 18 months and during this time has not brought any of his concerns to our attention.
"LivingTV has not seen any of your filmed evidence, but will fully investigate your claims."
Daily Mirror Story reporting the fake investigations of Most Haunted.
This next video, by Darker Image Studios shows the faked evidence, so just don't just take our word for it.
Most recent claim Most Haunted have made, was the capture of a real life ghost, actually caught on camera. WOW I hear you say,
I think Karl was off the day at camera school when they did special effects......
Chris Halton explains very well why this is fake, and I agree with him on this.
It is clearly an overlay of Stuart
Yvette tried to back track and said it was ''Stone Tape'' of what they was doing, So any way I went back to watching paint dry after picking myself up from the floor laughing so much at her explanation, oh deary me Yvette, I do think its time you stopped now.
And finally, a video compilation compiled by Youtuber "Chenzo 1969" showing a majority of fake evidence produced by Most Haunted to create the entertainment show, which if made properly with out the fake evidence, people would love it any way, and at least it would be honest.
By Most Haunted faking evidence, teams like ourselves get tarred with the same brush as faking evidence so we get noticed.
Let me tell you now, Ghost Investigation Team do not fake or create paranormal evidence on our investigations, we use scientific equipment to capture evidence, we do not rely on mediums, knocks and bangs that cant be explained, we try and verify and debunk as much of the evidence as we can to show you the audience of our findings, and if we dont find any, then we can't show any, as we most certainly do not fake any evidence.
The TV show that has spooked millions with its footage of hauntings and poltergeists has been exposed as a fake - by one its own stars.
Resident parapsychologist Dr Ciaran O'Keeffe has sensationally lifted the lid on the ghosthunting series, Most Haunted ... and claims that the public are being deceived by "showmanship and dramatics."
He accuses the show's medium Derek Acorah of hoodwinking viewers by pretending to communicate with spirits and obtaining information about locations prior to filming.
The Mirror has also obtained unedited footage which appears to show presenter Yvette Fielding and her husband faking 'paranormal' occurrences such as ghostly bumps and knocks.
Most Haunted has quickly achieved cult status since it was launched in 2002 and is LivingTV's most successful programme.
Millions of viewers tune in regularly to watch Ex-Blue Peter girl Yvette and her team of ghost hunters spend the night in some of Britain's most haunted locations.
It has made Acorah - who claims to be guided by an Ethiopian spirit guide called Sam - into one of the country's best-known psychics.
Tonight the show will start its biggest ever live vigil, a four-night Halloween special from East London following the murderous trail of Jack the Ripper.
Yvette Fielding has said of the show - which is made by her husband Karl Beattie's production company Antix Productions:
"There is no acting in this programme, none whatsoever. Everything you see and you hear is real. It's not made up, it's not acted."
The Ghost Investigation Team was formed after we started watching 'Most Haunted' way back in 2002, it was the only British paranormal Crew/series that was being aired on the ''LivingTV'' channel. It was a real eye opener and Most Haunted was the catalyst behing our team forming. We went out and bought the exact same gear they were using at the time, Sony night shot camera's, digital laser thermometers, and the tecpel EMF meter, we even visited the same locations as Most Haunted to use our equipment at. We even went to the Most Haunted Live shows, and was present with the so called flying spoon incident on the sunday night in Stafford.
We was hooked on the Paranormal, and exciting times lay ahead for us.
Then the first exposes came to light, as we saw the 'Most Haunted Crew' as our mentors at the time, we were gutted when Most Haunted was put in the frame, so many others fake the evidence as well, and this is what we focus on in this page.
It seems that television is the only medium where you can cheat and get away with it as long as it provides an audience and viewing figures that equal profit from advertising rights during the show.
A shame, as you do not have to fake evidence of the paranormal if you actualy investigate the haunted location, like we do.
Even Yvette tried to TWEET away the rumours that Karl faked the evidence.
This should quash the rumour mill......NOT!
We will first take a look at the 'Most Haunted' TV show.
Which currently (2017) resides on UKTV's ''REALLY'' Channel.
Karl Beattie and Yvette Fielding.
The GIT.UK team have investigated 30 East Drive, and found very little eidence of anything paranormal, let alone any poltergeist activity, which we have already covered in our chapter on poltergeists.
On one of the nights, Karl is supposedly dragged up the stairs, you can clearly see the wire/rope attached to Karl's waist, which he denies is the reason why he was pulled back with.
We show evidence to the contrary
Also show the explanation made by Karl and why he is lying with his version of events as he claims it is industry standard to tie the camera cable through a belt loop, thats fine, but as the clip above shows, Karl wasn't even carrying a camera at the time???????
The Most Haunted crew from 2015.
Most Haunted although have faked there evidence, and some you have to agree is so obvious, Stevie Wonder would not have even missed it.
Still to this day, Yvette and Karl still deny faking any paranormal evidence.
It remains just as popular today in 2017 as it did way back in 2002 when they first aired on LivingTv.
And the fans dont seem to mind, they just want to be entertained for an hour, which Most Haunted do, the do not investigate haunted locations, they just create an entertaining television programme.
and yes they still fake evidence and try and convince you it is real.
Ciaran, who joined Most Haunted in April 2004 became suspicious of Acorah's antics on a shoot at Castle Leslie, Co Monagh in Ireland where a 17th Century four-poster bed has been claimed to levitate.
Ciaran recalls: "As we walked into the bedroom, Derek touched the bed and came out with extremely accurate information.
"He insisted he got all the information just from touching the bed. But it was the wrong bed."
Antix Productions claims the mediums have no idea where they will be filming or know any details about the history of the locations.
But Ciaran says: "Derek must have had prior knowledge of the locations."
He devised a plan to see if Derek was deliberately deceiving the public.
While on a shoot at Bodmin gaol he invented a long-dead South African jailer called Kreed Kafer - an anagram of Derek Faker.
"I wrote the name down and asked another member of the crew to mention it to Derek before filming.
"I honestly didn't think Derek would take the bait. But during the filming he actually got possessed by my fictional character!"
Derek being possessed by Kreed Kafer during the show.
The spooky truth: Most Haunted exposed as a fake by star that claims Derek Acorah show features "showmanship and dramatics"
Parapsychologist Dr Ciaran O'Keeffe lifted the lid on the ghosthunting series.
This article first appeared in the Daily Mirror on 28th Oct 2005.
Pictures and video have been added by GIT.UK
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This page identifies the tricks used to fool you, all in the name of entertainment.
These shows at the start of the programme state, ''This Programme is for Entertainment Purposes Only''.
This is a poorly worded get out clause, so that no come back on the content of the show you are about to watch is the view of the channel that airs the show.
All I want to say to you reading this, is that GIT.UK do not fake any evidence, and we would wish for teams like Most Haunted to stop faking evidence.
They are bringing the proffession of Paranormal Investors into Dis-Repute, and tarring everyone with the same brush.