CHINESE Customs officials in Hunan province have admitted they are struggling to stamp out trafficking of drugs from Burma that may end up in Hong Kong or transit through the territory. The concerns were relayed to Hong Kong Customs officials on an unofficial 12-day visit to the southwestern provinces of Sichuan and Hunan. The officials visited the border between China and Burma last Wednesday where they were told a lack of manpower and often violent resistance were hampering efforts to clamp down on traffickers. The chairman of the Association of Customs and Excise Service Officers, Edmond Lam Ching-shek, said: 'Our aim is to increase mutual understanding between the two sides in the run-up to 1997. 'We were able to observe mainland Customs operations as well as find out more about our counterparts' union activities, such as health benefits and conditions of service.' The visit was arranged by Xinhua (the New China News Agency) and financed by association members.