Indigenous peoples have the right to be consulted and to free, prior, and informed consent regarding matters affecting them. This includes the right to be consulted on drug control measures and national and international agreements that may affect their lands, resources, cultures, and identities, as well as the right to give or withhold their consent.
In accordance with this right, States should:
i. Consult and cooperate in good faith with relevant indigenous peoples, through their representative institutions, in order to obtain their free, prior, and informed consent before adopting or implementing any drug control measure that may affect them or their territories. Ensure that consultations continue as needed throughout the period of implementation.
ii. Adopt legislative, administrative, and other measures necessary to recognise and ensure the right of indigenous peoples to be effectively consulted, in accordance with their traditions and customs, and the right to give or withhold their free, prior, and informed consent with regard to drug control measures that may affect them or their territories.
Here is where you will see the cited reference for the Commentary feature.