This remarkable footage captures the moment a man, his hands still stained with his victim's blood, confesses to a stabbing.

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"I robbed him and he wouldn't give me what I want so I stabbed him," the man can be heard telling a police officer, moments before he is arrested on suspicion of committing GBH with intent. The offender was later sentenced to 10 years imprisonment.

The video clip was released today by the Metropolitan Police as it launched a major trial of body cameras, to be worn by officers in 10 London boroughs, including Brent, Ealing and Hillingdon.

The cameras have already been used in some other boroughs like Hounslow, where selected officers have been wearing them since last autumn after receiving funding from Hounslow Council.

But police chiefs hope rolling them out more widely will help ensure speedier justice for victims, especially in domestic violence cases.

Met Police Commissioner Sir Bernard Hogan-Howe said: "Body-worn video will not only help us fight crime and support victims but help the Met to be more accountable.

"Our experience of using cameras already shows that people are more likely to plead guilty when they know we have captured the incident. That speeds up justice, puts offenders behind bars more quickly and protects potential victims.

"Video captures events in a way that can’t be represented on paper in the same detail and it has been shown the mere presence of this type of video can often defuse potentially violent situations without the need for force to be used.

"I believe it will also show our officers at their best, dealing with difficult and dangerous situations every day but it will also provide clearer evidence when its been alleged that we got things wrong. That has to be in both our own and the public’s interest."

The cameras will not be permanently switched on but officers will use them to collect evidence when dealing with incidents including suspected cases of domestic abuse. They will also be used to capture footage for potentially contentious interactions such as the use of stop and search.

A total of 500 cameras will be distributed across 10 London boroughs: Barnet, Bexley, Bromley, Brent, Camden, Croydon, Ealing, Havering, Hillingdon and Lewisham.

Two response teams on each of these boroughs will wear the cameras, attached to their body armour, as they respond to emergency calls during the year-long trial.

When the cameras are recording, a flashing red light will appear. Any footage will be uploaded at the end of the officer's shift and will be deleted after 31 days unless needed as evidence.

What do you think? Should police wear body cameras?

* A second video originally published with this story has been removed as the victim only gave permission for it to be used for 24 hours