Ali Dizaei served around 16 months after twice being convicted of unlawfully arresting a business acquaintance, Waad al Baghdadi, and then trying to frame him. But Dizaei claims it was a miscarriage of justice.
For many years Iranian-born Dizaei was one of Britain's most high profile policemen. A high-ranking officer and the president of the Black Police Association, he consistently accused his own employers of racism. A problem which he says persists today.
Dizaie says his time in jail was a living hell. He was assaulted twice and feared for his safety every day.
But despite the negative media coverage and his many enemies with the police force, Dizaei says he's determined to appeal his conviction, clear his name and eventually return to his job.
Any sympathy for Ali Dizaei is likely to be in short supply here at Scotland Yard. The Metropolitan police has spent an estimated £11 million investigating and mounting a case against him. And they'll doubtless be irritated by the fact that he doesn't seem to be going away.