There is now "sufficient evidence for a realistic prospect of conviction" of PC Alex MacFarlane, a Crown Prosecution Service review concluded.
Lawyers studied footage appearing to show the officer say to a 21-year-old black man: "The problem with you is you will always be a n*****, yeah?".
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He is the first professional rugby union player to do so - and told ITV News he hopes he can be an inspiration to young people.
An inquest into the death of a 14-year-old cadet heard how his teammates tried to radio for help in his final moments.
Ecuadorian officials considered a number of plans to smuggle the Wikileaks editor-in-chief out of their embassy in London.