The Independent Police Complaints Commission said that Coleman-Farrow appeared to be a "rogue officer who set out to deceive".
Deputy Chairwoman Deborah Glass said their investigation did not reveal any systemic or serious supervisory failings, and that the Metropolitan Police had reviewed all cases where he was the officer in charge.
"While we may never fully understand the motivation for his actions, Mr Coleman-Farrow appears to have been a rogue officer who set out to deceive.
"While dealing with rogue individuals must always be a concern in any system, supervisory systems will not necessarily pick up on an officer who has concocted evidence to cover their tracks."
The Metropolitan Police dismissed Coleman-Farrow in April 2011.
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The film had formed part of a commemoration to the Choucair family, three generations of whom died in the fire.
John Nolan, who was found with cigarettes and two lighters, suffered burns on 65% of his body after being alight for around six minutes.
Known as Pily she died in January, seven months after the disaster, having suffered a stroke.