Japan police face controversy over new 'face-scan' smartphone unlocking technique

Japanese police have begun employing a controversial new method to unlock suspects' smartphones, sparking debate over investigative techniques and privacy rights. The approach involves obtaining arrest warrants for physical examinations, allowing officers to forcibly use a suspect's face or fingerprint to authenticate and unlock their device.

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Police have begun using a new investigative technique to forcibly authenticate (biometric authentication) suspects' faces or fingerprints to unlock their smartphones with arrest warrants.

This tactic was reportedly used in an investigation into "Natural," a large-scale illegal recruitment organization suspected of exploiting women. When police raided a suspected base of operations, they seized a suspect's smartphone locked by facial recognition. To bypass the security, officers obtained a warrant for a physical examination, which included instructions to hold the suspect's face within 20-50 cm of the phone for about a second if they refused to comply.

While police stated the need for smartphone analysis is increasing due to encrypted communications among criminals, the use of physical examination warrants for biometric authentication is unprecedented in Japan. Previously, such warrants were typically used for examining physical evidence like drug injection scars. The method has drawn criticism for its potential for abuse, with reports of police forcibly lifting a suspect's head during an operation leading to legal disputes.

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The need for smartphone analysis is increasing as criminals communicate via highly secure applications among accomplices.

Concerns are amplified by legal precedents in other countries, such as a US federal court ruling that found forced biometric authentication to access smartphones unconstitutional. The debate highlights the tension between law enforcement's need to access digital evidence and individuals' privacy rights in the digital age.

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In the United States, there is a federal court precedent that deemed the act of forcibly performing biometric authentication to check smartphone information unconstitutional.