Hundreds of officers in Hounslow took to the streets wearing body worn video (BWV) cameras on Wednesday (June 7).
The 330 new cameras were rolled out to frontline police officers and Police Community Support Officers (PCSO).
Specialist departments will also be given cameras.
Borough commander Raj Kohli said the move will help improve an already "great job" being done by his officers.
Chief Superintendent Mr Kohli said: "I am really looking forward to body worn videos making a real difference to the people of London - helping convict criminals, helping protect vulnerable people, helping officers in doing an exceptionally difficult job to the best of their ability.
"The police officers and staff of Hounslow already do a great job - this will make them even better."
The use of the cameras have already proved to bring speedier justice for victims, particularly in cases of domestic abuse where offenders have entered guilty pleas earlier due to the evidence.
BWV offers greater transparency to people in front and behind the camera.
It also provides greater reassurance to Londoners during their interactions with the police and helps police gather evidence.
All footage recorded on BWV is subject to legal safeguards and guidance.
Footage from the camera is automatically uploaded to secure servers once the device has been docked and flagged for use as evidence at court or other proceedings.
Video not retained as evidence or for policing is automatically deleted within 31 days
A member of public who wishes to view footage taken of them can make a request in writing, under freedom of information and data protection laws.
The request must be within 31 days of the incident unless it has been marked as police evidence.
A BWV camera is attached to an officer's uniform and the public are informed as soon as is practical they are being recorded.
The device does not permanently record to ensure interactions are not impeded.
A flashing red circle in the centre of the camera means it is recording, and has a frequent beeping noise when it's activated.
In total 22,000 cameras will be deployed to police officers over the coming months to all 32 London boroughs in a phased approach aimed to be completed by the summer.
The cameras will be issued to a number of frontline specialist roles including overt firearms officers.
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