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South Korea's Supreme Court ruled that a drunk driving test cannot be used as evidence if the suspect was not given water to rinse their mouth before the test. The decision, reported by Hankyung on October 25, 2026, means that failing to provide mouth rinse water renders the breathalyzer result inadmissible in court. Korean legal observers are discussing the ruling's impact on DUI enforcement procedures, with some noting it could lead to stricter protocol compliance by police.