Is a California MMJ Card Valid in Other U.S. States? Yes. Arizona, Hawaii, Maine, Nevada, New Hampshire, Rhode Island, and Michigan recognize a valid, in-date medical marijuana identification card and recommendation letter from California. However, entrance into another state’s medical cannabis dispensaries is at the dispensary’s discretion. Reciprocity means that participating states recognize California medical marijuana cards and recommendations as valid. Whether California recognizes medical marijuana cards from other states is still yet to be decided, but it looks as if the answer is “no” so far.