A taxi driver was arrested for driving under the influence of drugs after stopping his vehicle in the middle of Tuen Mun Road early yesterday and being found with white powder on his nose. An initial investigation found that the powder was ketamine and a small bag of the drug was also found in the car, police say. The 28-year-old driver was heading towards the New Territories when he suddenly stopped near So Kwun Wat shortly before 4am, almost causing trailing cars to crash. A traffic officer found the man was partially conscious in the driver's seat but did not respond to any requests to open the locked doors. Firemen were called to rescue the man, but just as they were about to break a window, the driver opened the door. He then stepped out of his car with white powder on his nose. Police say they found a bag of about 1.7 grams of ketamine in the car. The driver was sent to Tuen Mun Hospital for a check-up and was later arrested for driving under the influence of drugs or alcohol and possession of drugs. Meanwhile, the Practising Pharmacists Association warned Christmas party-goers that they should not drink and drive, and that 'alcohol metaboliser' products - which supposedly decreased or delayed alcohol absorption - were unreliable. Association president Iris Chang said many brands were on sale in the city - some guaranteeing sobriety even after 1,000 alcoholic drinks - but there was no scientific support for the claims. 'If people believe in these claims, they may drink and drive, which can cause serious traffic accidents.' Manufacturers of the products claim they can increase the body's metabolism rate, decreasing or delaying alcohol absorption. Last year in Hong Kong, 52 people died of liver disease related to the use of alcohol, and 10 died of accidental alcohol poisoning, the Centre for Health Protection said. A total of 2,422 people were admitted to hospital after consuming alcohol - which can lead to liver diseases, poisoning and mental or physical problems. A Department of Health survey found 17.4 per cent of men and 13.5 per cent of women drank more than the recommended daily limit over the 30 days before the April poll. That limit is two glasses of red wine, or the equivalent amount of alcohol, for a man and one glass of red wine for a woman. The survey of 2,185 people aged between 18 and 64 also found that 13.8 per cent of men and 3.8 per cent of women drank more than five cans of beer or five glasses of wine a day.