In June 1987, the United Nations Ministerial Conference on Drugs was held in Vienna, the capital of Austria, with more than 3,000 representatives from 138 countries attending the International Conference on Drugs. The conference adopted a comprehensive multidisciplinary agenda for the worldwide spread of drugs. At the end of the 26th session, the delegates unanimously adopted a resolution to designate June 26 every year as the ¡°International Day on Drugs¡± in order to bring attention to the world¡¯s drug problems, while calling on the world¡¯s people to jointly solve the drug issue. The worldwide spread of drugs has become a serious international crime. According to the United Nations statistics, the worldwide drug trade amounts to more than $500 billion a year, is the second largest worldwide sale of people after the firearm trade. In the 1980s,