Under the Single Convention on Narcotic Drugs, the Office for Medicinal Cannabis Research (OMC) has the exclusive right of importing and exporting cannabis, cannabis extracts and cannabis resin. The Convention provides for this monopoly so as to prevent the diversion of cannabis into the illicit traffic.
If a business or person wishes to import or export these products they can only do so via the OMC, and only if they have an exemption from the Opium Act. For a fee the OMC ensures that the necessary Dutch documentation is in place and arranges transport.
There are separate rules for transporting cannabis for personal medical use outside the country.