Currently, VA physicians are prohibited from making such recommendations. The Drug Policy Alliance has issued a press release that offers a good overview of the provisions and the need for the change. Link here to the full press release:

Photo Credit: Licensed under CC BY-SA 3.0 via Wikimedia Commons – File derived from P derecho.svg,User: Kontos; Rod_of_asclepius.png, Catherine Munro; derivative work: Anka Friedrich.