He has been involved in uncovering some of the biggest racing scandals in Hong Kong for more than a decade, but Dr Terence Wan See-ming and his team at the Jockey Club Racing Laboratory are more proud of the fact that every sample is treated the same - and that every test is right.
The chief racing chemist is the guardian of the laboratory's unbelievable record of 41 years without reporting a false positive and, with more than 20,000 samples to analyse each year, that achievement is the envy of the drug-testing world.
Wan is in charge of the HK$60 million laboratory at Sha Tin racecourse, and leads a team of 45 staff, whose primary function is to analyse blood and urine samples taken from every horse in Hong Kong, every time they race, and to routinely test the jockeys for prohibited substances.
His team also provides support to international clients, and runs the molecular 'fine-toothed-comb' over positive samples which have ended careers, and even embarrassed some of the world's most powerful people.
In April 2009, Sheikh Mohammed bin Rashid al-Maktoum, ruler of Dubai and one of the most prolific racehorse owners on the planet, withdrew from competition in an endurance race in the United Arab Emirates, after learning two horses he had ridden in recent endurance events had failed drug tests.
Wan confirmed through analysis that his horses tested positive to guanabenz, a drug used to relax blood vessels and control high blood pressure, which resulted in Maktoum serving a six-month suspension.
The penalties are not always so lenient, however, and when the team come across a sample irregularity in their routine testing, careful analysis is conducted to identify the exact substances and amounts before reporting the positive result to the Jockey Club's stewards, who have ended the careers of jockeys and trainers on the basis of the laboratory's work.