1. Investigation College,People's Police University of China,Langfang 065000,China;
2. Immigration Management College,People's Police University of China,Langfang 065000,China
Abstract In order to control drug better, the relationship between chemistry and drugs is clarified and expounded systematically from the four aspects: why drugs are chemicals (the essence of drugs), drug testing and identification, the essence of drug addiction and the transformation of drugs from traditional to new type.