Photo/IllutrationTransport ministry officials inspect Japan Airlines Co.'s office at Tokyo's Haneda Airport in November. (Asahi Shimbun file photo)

The transport ministry will require domestic airline pilots to undergo post-duty alcohol tests to ensure they have not cheated in the pre-boarding screening process or consumed booze during the flights, an interim report showed Dec. 25

The measure will start by the end of March.

The ministry has been considering new rules since a co-pilot for Japan Airlines Co. was arrested at Heathrow Airport in London in October after failing a sobriety test before a flight to Tokyo. He had apparently cheated on an in-house breath-alcohol test also attended by his colleagues.

The report also says all tests must use sophisticated breath-alcohol devices.

Pilots employed by foreign airlines and those who fly private aircraft will not be subject to the mandatory alcohol tests, but they may face unannounced testing during the ministry's on-the-spot inspections.

The ministry has already announced a blanket guideline that limits all pilots, including those working for foreign airlines and those licensed to fly only private aircraft, to 0.09 milligram of alcohol per 1 liter of breath.

But the rules will be stricter for pilots of the 67 domestic airlines. They will be prohibited from flying if any trace of alcohol is detected in the tests.