This thesis addresses the issue of purchase covert (undercover buy) as a strategy for drug-related crimes disclosure (juridical-empirical studies in Pontianak) .This method used in this study is a research method using Normative-Sociological approach. Undercover buy as stipulated in Law No. 22 of 1997 concerning narcotic replaced by Law No 35 of 2009 as a provision of investigator competence in combating narcotic dealing. This is due the nature of narcotic crime which is an organized, undisclosed, done with complex modus operandi and high level of technology resulting difficulties to gather evidence. On the contrary of other crimes, undercover buy didn\u27t violate Human Rights, if done under the law. However it will differ if done discordantly based on the law. This is caused by the involvement of people to combating narcotic crime, thus their rights must be preserve.In consequence, to diminish the errors of undercover buy, investigator must know and acknowledge the procedures of undercover buy as stipulated in Law 35 of 2009
