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FBI Obtains 'Off The Record' Jailhouse Interview Between KPIX 5 Reporter, 'Gone Girl' Kidnapping Suspect

(CBS SF) -- The FBI has obtained an "off the record" jailhouse interview in which a Harvard-educated attorney and former Marine told a KPIX 5 reporter he was the mastermind behind a bizarre Vallejo kidnapping.

Matthew Muller, 38, is now facing state charges for a home invasion and federal charges for the kidnapping of Denise Huskins, a case police initially called a hoax and dubbed the "Gone Girl" case, referring to a book and movie about a kidnapping mystery.

On Wednesday, Muller's attorney was set to ask a judge to throw out evidence seized from his client, including drones and a SuperSoaker made to look like a laser-sighted handgun. He claims those items were obtained during an illegal search of a storage unit rented by Muller.

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Even if Muller's attorney is successful, prosecutors claim to have damning evidence that could aid in their prosecution against Muller: the recorded jailhouse interview in which Muller admits to the crime in the interview with the KPIX reporter, Juliette Goodrich.

In an affidavit filed August 14, 2015, the FBI documented the July conversation between Goodrich and Muller, and revealed that Muller was investigated for similar crimes in Palo Alto and Mountain View in 2009.

Muller also appears to answer the question of whether or not he acted alone.

Muller said a number of things "off the record and on background." He said that the anonymous emails were sent because Vallejo Police had said that Victim F's account was untrue. He said that he had a psychotic break in 2009 (the year that the Palo Alto and Mountain View events occurred). He said ascribed his conduct to mental illness, a belief in some kind of conspiracy, and some kind of supposed side effect from a vaccine. He said that victim of the Dublin break in was not random. In the context of discussing the kidnapping of Victim F "off the record and on the background," Muller said that there was no gang and that it was just him.

News of the FBI's access to the jailhouse affidavit was first reported by Wired. Goodrich stated that Muller did not deny a role in the crime in her report on the jailhouse interview, but purposely left out the "off the record" portion.

"When Muller told me in our jailhouse interview, 'you cannot use certain things I am telling you in your publication,' I did not," Goodrich said. "However it turns out 'off the record' does not pertain to the feds. And when you are in jail, you lose your right to privacy unless you are speaking with your attorney or a priest."

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She spoke with Huskins' attorney Doug Rappaport Wednesday who all along was adamant about getting the FBI involved when the kidnapping was first reported.

'There was an overwhelming amount of circumstantial evidence that linked Muller to the crime but now there's direct evidence which is his detailed admission he was the kidnapper that was recorded during your jailhouse interview," Rappaport told Goodrich Wednesday morning.

Muller's hearing on the motion to throw out evidence was scheduled for 2:00 p.m. Wednesday.

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