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Cops can force suspect to unlock phone with thumbprint, US court rules

Ruling: Thumbprint scan is like a "blood draw or fingerprint taken at booking."

Judges rejected his claim, holding "that the compelled use of Payne's thumb to unlock his phone (which he had already identified for the officers) required no cognitive exertion, placing it firmly in the same category as a blood draw or fingerprint taken at booking." Payne conceded that "the use of biometrics to open an electronic device is akin to providing a physical key to a safe" but argued it is still a testimonial act because it "simultaneously confirm[s] ownership and authentication of its contents," the court said. The Court held that this act of production was of a fundamentally different kind than that at issue in Doe because it was "unquestionably necessary for respondent to make extensive use of 'the contents of his own mind' in identifying the hundreds of documents responsive to the requests in the subpoena."

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