No as of today (1/13/2018) you dont need a medical card
Currently you still need a valid US ID and a recommendation from a doctor to enter Barbary
You need a recommendation letter for ANY medical cannabis dispensary. Now when recreation cannabis starts in January 2018 that may change but i am not sure how many dispensaries will do both rec and medical.
You still need your card
Need a card
Tourists can't visit any place without a proper medical evaluation and US drivers license or ID
One alternative to your personal medical approval;) besides in the grey areas and streets...you could get 215/420 care Certified
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