A senior counter-terrorism detective who is the first person to be convicted under the fresh investigations into corruption and phone hacking has been jailed for 15 months.
Detective Chief Inspector April Casburn was sentenced at the Old Bailey today for misconduct in public office for offering to sell information to the News of the World (NotW).
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Mr Justice Fulford told her it was "a corrupt attempt to make money out of sensitive and potentially very damaging information".
Casburn, 53, is currently in the process of adopting a child, and the judge said had that not been the case he would have sentenced her to three years.
He said her offence could not be described as whistle-blowing, and went on: "If the News of the World had accepted her offer, it's clear, in my view, that Ms Casburn would have taken the money and, as a result, she posed a significant threat to the integrity of this important police investigation."
The judge went on: "Activity of this kind is deeply damaging to the administration of criminal justice in this country. It corrodes the public's faith in the police force, it can lead to the acquittal or the failure by the authorities to prosecute individuals who have committed offences whether they are serious or otherwise.
"We are entitled to expect the very highest standards of probity from our police officers, particularly those at a senior level.
"It is, in my judgment, a very serious matter indeed when men or women who have all the benefits, privileges and responsibilities of public office use their position for corrupt purposes."
He said he was particularly concerned about Casburn's child, and admitted that her absence while she is in prison could be damaging.
But he said that, had she not been arrested, the detective would have returned to work by now, and therefore the child would be cared for by others anyway.
Casburn, from Hatfield Peverel in Essex, called the NotW news desk on September 11 2010, and spoke to journalist Tim Wood about the fresh investigation into phone hacking.
She claimed she contacted the tabloid because she was concerned about counter-terror resources being wasted on the phone-hacking inquiry, which her colleagues saw as "a bit of a jolly".
The detective denied asking for money, but Mr Wood had made a note that she "wanted to sell inside information".
Today Mr Justice Fulford said: "It seems to me Mr Wood was a reliable, honest and disinterested witness.
"He took time and trouble during the defendant's call to find out exactly what Miss Casburn was saying, questioning the defendant in detail on her account in order to make an accurate note for his superiors at the News of the World which he wrote up in detail immediately afterwards.
"He had absolutely no reason to lie and every cause to be cautious given the risk that the newspaper was to be the victim of a sting, as he suspected."
During her trial at Southwark Crown Court last month, Casburn likened the male-dominated counter-terrorism unit to the TV series Life On Mars.
She was not given a desk for several months, despite more junior colleagues having them, jurors were told.
But the judge rejected this as an explanation for her behaviour.
He said: "It seems to me this is a straightforward but troubling case of corruption.
"I decline to accept that she had significant difficulties working with her male colleagues in the senior ranks of the counter-terrorism unit, which in part she said led her to act as she did.
"The most that could be said is that she was a relative newcomer to this area of police work. As a result she may have felt something of an outsider."
But he said this "could not begin to explain the actions of a detective chief inspector who offers to the very newspaper which is the subject of a sensitive and confidential investigation by other officers to sell details of the progress of the inquiry and the strategy that officers were intending to follow".
Defending, Patrick Gibbs QC had asked the judge to pass a suspended sentence, on the grounds that Casburn serving time in prison could cause "life-long" damage to the child she and her partner are adopting.
He said the phone call was "almost inexplicable" and "mad".
Casburn was facing a separate charge under the Official Secrets Act, which could only be dealt with by magistrates, but the prosecution offered no evidence in that matter today.
Scotland Yard released a statement to say: "It is a great disappointment that a Detective Chief Inspector in the Counter Terrorism Command should have abused her position in this way.
"We hope that the 15-month prison sentence handed down to this officer sends a strong message that the leaking of confidential information for personal gain is absolutely unacceptable and will not be tolerated.
"There is no place for corrupt officers or staff in the MPS.
"DCI April Casburn proactively approached the News of the World, the very newspaper being investigated, to make money. She betrayed the service and let down her colleagues - the hard-working honest police officers who make up the vast majority of the MPS.
"Fortunately this type of behaviour is rare but we hope today's verdict shows the public can have confidence that the MPS holds itself to account."
The case against Casburn came about because of information given to police by News Corporation's Management and Standards Committee.