"Any examiner whose pass rate differs from their test centre's average by 10 per cent is investigated," he said. "The only way I could have met the target was to pass poor drivers, which I wasn't prepared to do." The DSA wouldn't comment on Murray's tribunal success, but a spokeswoman said: "We don't look to maintain pass rates at test centres, but we ensure examination standards are consistent. One of our tests looks at examiners whose pass rate differs by 10 per cent from their centre average." The spokeswoman admitted the agency runs a bonus pay system. She said it was based on the DSA's performance as a whole, and confirmed examiners who under-performed may not get a share.