Metropolitan Police Commissioner Sir Bernard Hogan-Howe said the body-worn video cameras being trialled would result in speedier justice for victims and help the force be "more accountable".
The commissioner said: "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 it's been alleged that we got things wrong. That has to be in both our own and the public's interest."
Metropolitan Police Commissioner Sir Bernard Hogan-Howe has told ITV News that it was "pretty awful" to hear the findings of the report into Stephen Lawrence's murder investigation.
"As a professional police officer and then to see the reaction of Mr and Mrs Lawrence who were clearly distraught by what it had heard having lost their son so many years ago, at any level, human or professional, it is pretty awful to hear that list of terrible events," he said.
The head of the IPCC has apologised to the Lawrence family for the police watchdog's part in prolonging the "family's search for the truth".
The Independent Police Complaints Commission (IPCC) said it has asked the family of a Hillsborough victim if they would like it to investigate recent allegations made against the UK's most senior officer, Sir Bernard Hogan-Howe.
Metropolitan Police Commissioner Sir Bernard Hogan-Howe has said the police do not yet have sufficient information to start an investigation into allegations of criminal activity relating to horsemeat contamination.
We've talked to the FSA and what we've asked them to do is to give us any evidence that they've got of a crime, and of course we will investigate.
People have got suspicions, I think the minister said there are two broad options, which is either negligence or criminal conspiracy.
They are the options, but of course we can't investigate to see which of the options is true, we just need some information to help us.
Secondly it sounds like there will be a jurisdictional issue. If there is a crime, is it one that has been committed within the UK, or is it one that has been committed abroad?
When we've established those two things, we will know whether or not we take any further action.
There has to be some evidence or intelligence at least on which to base an investigation. At the moment there's clearly suspicion, but not enough yet to start off an investigation.
MPs were today debating food adulteration in a House of Commons debate called by Labour.