The LFR was used around the mainline train stations in Croydon, East and West Croydon.
As a result of 22 alerts by the LFR technology, ten people were arrested on suspicion of offences including threats to kill, recall to prison for robbery and possession of an offensive weapon.
Eight people were also stopped who are subject to sexual prevention orders and officers were able to establish if they were complying with their conditions.
Four more people who had court imposed conditions were identified correctly and their condition checked.
There were no false alerts.
The technology scans faces of people passing through an area against a watchlist of people wanted by police, and sets off an alert when a match is made.
An officer will then review the match and decide if they wish to speak with the individual.
As part of the wider proactive operation, officers stopped and arrested a 24 year old man in North End for being in possession of a cross bow. Officers searched him and also recovered a pocket knife.
Chief Superintendent Andy Brittain, in charge of policing Croydon said: “We have been in Croydon today speaking to local people and businesses within our community about yesterday’s LFR operation and are delighted to have their support.
“We understand their concerns about crime in the area and it is good to show the tactics we are using to reduce it.
“I hope this goes some way to reassure them we are committed to listening to them and taking action where we can.”
Lindsey Chiswick, responsible for LFR for the Met said: “Live Facial Recognition is a precise community-based crime fighting tool that helps us to be more focussed in our approach to tackling crime, including robbery and violence against women and girls.
“The results are impressive – the details of anyone who is not a match are immediately and automatically deleted.”
The breakdown of arrests are