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This article presents an argumentative analysis of the debate between two Brazilian congressmen on the decriminalization of marijuana, broadcast on September 4, 2015 by Rádio e TV Câmara. The analysis describes the argumentative interaction through the examination of the construction and exchange of arguments between the participants of the debate, in order to discuss how the acts of internal and external refutation promotes the progression of the initial argumentative diptych, the exchange of argument-acting roles, as well as the co-construction of the argument script (argumentaire) regarding the policies to combat drugs. The results show how the co-construction of a discourse and a counter-discourse thematize/schematize different meanings about the “control” of drug use. [ABSTRACT FROM AUTHOR]