The use of facial recognition by police has come under a lot of scrutiny. In part-three of our series, 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: Albert Fox Cahn, Surveillance Technology Oversight ProjectPhil Mayor, ACLU MichiganCaptain Dori Koren, Las Vegas Police 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.