The OPEN Foundation (Stichting OPEN in Dutch) hosts the following video on vimeo.com featuring the dutch lawyer Adèle van der Plas. Adèle van der Plas is specialized in natural psychoactive substances and the law. In this video she gives a brief explanation on how the INCB (International Narcotics Control Board) regulates plants that by nature contain a controlled psychoactive substances. She goes in to more detail on how this law is interpreted and applied by the dutch law.
In this video she clearly shows how the International law on narcotics is interpreted differently by each member of the United Nations. It is important to be responsible and know which law applies to you before ordering any of these plants online, as the international law can be interpreted differently in each country.