Last month police officers protested outside Mr Mitchell's constituency office wearing T-shirt with the words "PC Pleb and Proud" printed on them.
Mr Mitchell admitted there was an exchange and resigned from the cabinet - but denied directly swearing at any officers and denied using the word "pleb".
While Mr Mitchell admits swearing during the incident, he denies directly swearing at the officer and insists he did not lose his temper or call him a "pleb".
"Pleb" - an old word given new life by claims Conservative Chief Whip Andrew Mitchell used it to describe police officers in Downing Street - was also shortlisted.
Last month, police officers protested outside Mr Mitchell's constituency office wearing T-shirt with the words "PC Pleb and Proud" printed on them and representatives have called for a full inquiry into the matter.
The BBC's home affairs correspondent Danny Shaw said the officer had backed up the Sun's version of events and the language - including the word "pleb" - that Mr Mitchell was reported to have used.
The spiritual heirs of these early recruits could be seen last year sporting "PC Pleb and proud" T-shirts as they protested against the alleged class-based slurs of government chief whip - and former army officer - Andrew Mitchell.
Nevertheless, one close ally of the prime minister told me that his colleague should not be put through the mill for a "momentary expression of exasperation" and said that he would be very surprised if the "pleb" word would have been used.
Tuesday's announcement follows a series of high-profile scandals, including the police cover-up of their role in the Hillsborough disaster, the media relations highlighted during the Leveson Inquiry, and the row over police claims that former Tory chief whip Andrew Mitchell called an officer a "pleb".
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While former chief whip Mr Mitchell admits swearing after a police officer refused to let him exit through the main Downing Street gate with his bicycle, he denies directly swearing at the officer and insists he did not lose his temper or call him a "pleb".
While Mr Mitchell admits swearing after a police officer refused to let him exit through the main Downing Street gate with his bicycle on 19 September last year, he denies directly swearing at the officer and insists he did not lose his temper or call him a "pleb".
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