What happens in Vegas... is captured on camera

The use of facial recognition by police has come under a lot of scrutiny. In part three of our four-part series on FaceID, host Jennifer Strong takes you to Sin City, which actually has one of America's most buttoned-up policies on when cops can capture your likeness. She also finds out why celebrities like Woody Harrelson are playing a starring role in conversations about this technology.

We meet:

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• Albert Fox Cahn, Surveillance Technology Oversight Project's (S.T.O.P.'s) founder
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• Phil Mayor, ACLU Michigan senior staff attorney
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• Captain Dori Koren, Las Vegas Police
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• Assistant Chief Armando Aguilar, Miami Police

Credits: This episode was reported and produced by Jennifer Strong, Tate Ryan-Mosley and Emma Cillekens. We had help from Benji Rosen and Karen Hao. We're edited by Michael Reilly and Gideon Lichfield. Our technical director is Jacob Gorski.