Yes, it's a clearance for a prescription. You're supposed to buy only from licensed dealers, unless you separately have permission to grow n-number of plants on your own. I'm only familiar with the Calif and Arizona cards. In those states you are permitted a maximum amount at a time. Whether that limit is stamped on the card or is only recorded in the computer network, I don't know, but I know that the police can look up your purchase history on the computer network -- it shows the date, time, and location of purchases. This permission to smoke marijuana is not permission to drive "high," though. You'll get arrested for driving under the influence of marijuana the same as a person without the medical card. Indeed!
Sloth...cold-hearted bradypus that you are...how could you not love those ducks? Warning: NSFW - Language, Drug Use https://youtu.be/hnHU2HgV6UU https://youtu.be/UGJSX7V6-FY