A 1948 Warrant Meets a 2026 Phone
During a raid on "Natural" — Japan's largest illegal job-placement ring, which funneled women into sex work and hostess clubs nationwide for referral fees police estimate at roughly ¥4.5 billion a year — Osaka Prefectural Police obtained something new from a court: a physical-inspection warrant authorizing officers to hold a suspect's face up to a seized smartphone to trigger facial-recognition unlock. If the suspect refused a voluntary request to unlock the device, officers were instructed to position the face 20 to 50 centimeters from the screen for about one second, per Asahi Shimbun reporting relayed by ID Tech Wire on August 12, 2026.
That warrant category exists under Japan's Code of Criminal Procedure provisions governing search, seizure, and bodily examination of a suspect — historically used to check for drug-injection marks or document injuries after an assault. Nothing in the statute contemplates device authentication. Police reasoned that Natural's internal communications app let members remotely wipe data the moment a raid began, so waiting for a passcode to be volunteered risked losing evidence before it could be preserved. That is a real operational problem: the same investigation has already been slowed by the ring's counter-surveillance discipline, including a dedicated internal "virus countermeasures" unit that trained members to resist police, and it has been marred by a scandal in which six Osaka investigators were themselves indicted for assault during an earlier search of the same group. Police were not inventing an urgency; they were responding to a group that has repeatedly out-maneuvered them.
The Steelman
The case for stretching the warrant is not frivolous. Evidence-destruction risk is a recognized basis for expedited process in criminal procedure everywhere, and a self-deleting app is about as close to a ticking clock as digital evidence gets. Facial unlock, on its face, looks less invasive than the alternatives: no needle, no forced blood draw, no compelled recitation of a passcode that could itself implicate the suspect under the privilege against self-incrimination. Hitotsubashi University law professor Daisuke Midori — who has previously written on the gap Japanese law leaves around post-arrest examination of phone contents, including in response to the U.S. Supreme Court's Riley v. California — reportedly did not call the warrant itself improper. His concern was narrower and, frankly, more serious: execution.
Where the Steelman Breaks
A warrant to examine a body for physical evidence and a warrant to compel a biometric key are not the same instrument wearing different clothes. An injury exists whether or not the suspect cooperates; a face-unlock does not work if the suspect closes their eyes, looks away, or grimaces. That single fact is why this expansion is more dangerous than it first appears. To make the warrant functional, officers face pressure to escalate — prying eyelids open, restraining the head, holding a face at a fixed angle against resistance — categories of force the warrant was never written to authorize and that a Kansai-region officer quoted in the same reporting called "unthinkable." Midori's phrase, that execution risks exceeding "the limits of the use of force accepted by social norms" (社会通念上許容される限度), is a precise description of a warrant whose only path to working requires officers to improvise force the judge who signed it never approved.
There is also a self-incrimination problem the passcode comparison obscures rather than resolves. Japan's Constitution, like the US Fifth Amendment tradition it partly echoes, draws a line — however contested — between compelling a body to be examined and compelling a mind to produce testimonial content. A passcode lives in memory; a face does not. But treating that distinction as dispositive assumes the only thing being compelled is the unlock action itself, when in practice what is being compelled is access to the entire contents of a phone — messages, location history, contacts, financial apps — on the strength of a warrant category built around bruises and needle tracks, with none of the specific safeguards a search-and-seizure warrant for digital devices might otherwise carry.
The Proportionate Fix
None of this argues against giving police a lawful, fast path to seized-phone evidence when a suspect's own organization is built to destroy it. It argues against improvising that path out of a 1948-era body-examination warrant never subjected to legislative or judicial scrutiny for this use. Japan's Personal Information Protection Commission already treats facial-feature data as an "individual identification code" carrying heightened protection under the Act on Protection of Personal Information — reflecting a settled view within the Japanese government that biometric data is not an ordinary evidentiary category. Criminal procedure should catch up: a purpose-built statutory warrant for compelled biometric device-unlocking, with explicit force limits, judicial sign-off tied to specific evidence-destruction risk (not a blanket organized-crime label), and a hard prohibition on physically forcing eyes open, would give investigators the speed they say they need without leaving the boundary of permissible force to be worked out improvisationally, raid by raid, by whichever officer is holding the phone.