The Convention said that `` The contracting Powers shall use their best endeavors to control , or to cause to be controlled , all persons manufacturing , importing , selling , distributing , and exporting morphine , cocaine , and their respective salts , as well as the buildings in which these persons carry such an industry or trade . '' The Convention provided that `` The contracting Powers shall use their best endeavors to control , or to cause to be controlled , all persons manufacturing , importing , selling , distributing , and exporting morphine , cocaine , and their respective salts , as well as the buildings in which these persons carry such an industry or trade . ''