How Phone Face Recognition Works, and Why It Fails Differently in Policing
Modern phones unlock with face recognition by projecting over 30,000 invisible infrared dots onto the face and reading their distortion to build a 3D depth map. That map is converted into a numeric embedding, which is compared against an enrolled template inside the phone's isolated Secure Enclave. The article contrasts this with police face-matching systems, citing the 2020 case in Detroit where Robert Williams was wrongly arrested after a computer match and held for about 30 hours. Detroit later settled his case for $300,000 and banned arrests based on a face match alone. The piece argues that phone and police systems perform fundamentally different jobs, which explains their very different reliability.
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