The National Police Agency said Thursday it will re-examine 199 drunken driving cases due to concerns that faulty breathalyzers may have been used as a basis for convictions.

The NPA announced the move following revelations that a new type of breathalyzer introduced late last year by some prefectural police forces malfunctions when used in cold air. The devices suspected of malfunctioning were used in eight of the 199 cases, which took place in Fukuoka, Yamagata, Shiga, Wakayama and Kumamoto prefectures.

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