The Post Office defended its supervision system yesterday after a postman was arrested for allegedly trafficking $8 million worth of Ecstasy tablets through the mail. Postmaster-General Allan Chiang Yam-wang was speaking after Wong Sai-keung was allegedly caught at 6pm on Tuesday carrying 30 parcels in his bag containing 24,700 tablets from the Netherlands while delivering letters in a building in Tak Man Street, Hunghom. Three more parcels with 2,500 tablets were seized from the mail distribution division in Kowloon City. Wong, 48, has been charged with one count of trafficking in Ecstasy and appeared in Kowloon City Court yesterday. He did not enter a plea and his case was adjourned until July 8 for government chemist reports. Acting principal magistrate Colin Mackintosh ordered Wong to be remanded in custody. Mr Chiang said law-enforcement agencies were occasionally consulted on ways to plug security loopholes in the mail delivery system and he did not see a need to strengthen existing supervision. 'We have a closed-circuit television system in the big offices. We also have postal inspectors supervise outdoor work,' he said. 'This is an isolated incident involving problems with an individual's conduct. We absolutely do not tolerate anyone who uses the mail to commit illegal activities.' Another Post Office spokesman said any recommendations from customs officials would be considered once the investigation into the case was completed. Superintendent Daniel Cheung Chi-kwong, head of customs' drug investigation division, said yesterday help was being sought from overseas law enforcers, including the Dutch police, to help identify the smuggling route used by the drug ring.