According to new reporting by WalesOnline , police in South Wales scanned the faces of more than 44,000 people at the “Biggest Weekend” event in Swansea earlier this year—and of those, there were only 10 false positives.

That’s a significant improvement over a similar trial run at a 2017 soccer championship in Cardiff, in which 92 percent were incorrect matches.

The South Wales Police have attributed the improved matching to a “new algorithm” from its contractor, NEC.

"With each deployment of the technology we have gained confidence in the technology, and this has enabled the developers at NEC to integrate our findings into their technology updates,” WalesOnline quoted the SWP as saying.

During the Biggest Weekend event, the facial recognition system flagged a person who had an outstanding arrest warrant, and officers took the person into custody.

In the United States, facial recognition is in use—it was recently used to identify the Capital Gazette shooter in Maryland—by some law enforcement and also at some airports.

Just last month, the American Civil Liberties Union used Amazon’s Rekognition tool to show that it falsely identified 28 members of Congress as people who had been arrested.