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.
More top news
Scotland Yard said the male youths will appear in custody at Westminster Magistrates' Court on Saturday.
The family of Oliver Dearlove urged people to "think again" before using their fists, as the man who killed him began a six-year jail term.
London Fire Brigade took Southwark Council to court on four charges in relation to safety breaches at Lakanal House in Camberwell.