You need to have a residence in DC to apply for a medical dispensary card. You need to have the application signed by a medical professional. then you will submit the application to the government for approval. If approved, you will receive your card via registered mail which you will need to sign for at your residence or closest post office. It is a long process, not something you can do in a day
You need a valid medical cannabis license and photo ID to go to ANY D.C. dispensary. Look into your state's cannabis laws to find out how to get a medical card or contact the dispensary.
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