The dispensaries will be the only point where patients will encounter medical marijuana. To get it, they will be required to see a doctor who is certified and registered with the state Department of Health. The doctor will write a letter stating that the patient suffers from one or more of 17 qualifying conditions. It is up to the patient to submit the letter to the state and receive an ID card. Only card holders will be allowed to enter, and they will be able to buy medical cannabis from any dispensary in the state.