Prosecutors have received all of the outstanding evidence in the “plebgate” case and will now determine whether charges should be brought over the row.
Former chief whip Andrew Mitchell was accused of launching a foul-mouthed rant at officers guarding Downing Street as he was asked not to cycle through the main gates on 19 September 2012.
Mr Mitchell has denied calling officers "plebs".
Eight people including five police officers have been arrested as part of the Operation Alice investigation into the events surrounding the alleged incident.
The five constables are from the Diplomatic Protection Group, which is responsible for guarding politicians and foreign dignitaries, and includes a 46-year-old woman who was present when the row broke out.
Two of the officers - the woman and a man aged 46 - were arrested over alleged leaks to the media about what had occurred.
The members of police staff are two women aged 46 and 49 who were arrested on suspicion of assisting an offender, and a 23-year-old man who was detained in December.
A Crown Prosecution Service spokesman said: "We have now received all of the outstanding evidence in this case and are now considering the file to determine whether charges should be brought."
"We aim to make a decision as soon as is reasonably possible."
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