The Metropolitan Police has ended its involvement in the criminal investigation into the placing of bets on the date of the general election.
The force previously said it was probing whether a “small number” of bets on the July 4 poll had involved more serious offenses including misconduct in public office.
A number of Conservatives have been caught up in the Gambling Commission inquiry, including Rishi Sunak's former parliamentary aide, Craig Williams.
But Scotland Yard said after a review of evidence with the CPS, “it was determined that the high bar for misconduct in public office to be proven was not met”.
The investigation by the Gambling Commission into whether offenses were committed under the Gambling Act continues.
Detective Superintendent Katherine Goodwin said: “These allegations caused a significant dent in public confidence during the election campaign and it was right that they were investigated to explore all possible offences.
“While our involvement in the criminal investigation now ceases, it is important that it is not misinterpreted as an all-clear for those whose cases were looked at.
“There are still Gambling Act offenses to consider and it is appropriate that they are taken forward by investigators from the Gambling Commission who have particular expertise in this field.
“Seven police officers who are alleged to have placed bets are still among those being investigated by the Gambling Commission. They also remain under investigation by the Met's Directorate of Professional Standards.”
Andrew Rhodes, chief executive of the Gambling Commission, said: “We have remained focused on our criminal investigation into confidential information being used to gain an unfair advantage when betting on the date of the general election.
“Our investigation continues to progress and we have interviewed several suspects under caution. We are continuing to interview a number of witnesses, who are co-operating with this criminal investigation, as well as gathering further documentary and electronic evidence.
“We clearly appreciate the level of public interest there is in this investigation but in order to protect the integrity of the investigation and to ensure a fair and just outcome, we are unable to comment further at this time, including the name of any person who may be under suspicion, or the total number of suspects.”
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