Every country and state has its own laws and regulations according to their current governments and preferences, however, some of the countries have declared the marijuana card legal for use due to the medical requirements. The medical marijuana card is the card that is allowed by doctors only to treat the two most severe kinds of diseases which are Epilepsy and one of its other severe types. However, according to the U.S drug enforcement the marijuana is ranked under the same level 1 drug which causes the same effects and ecstasy like heroin, however, marijuana also has some medicinal purpose as well but their extreme use as drugs the country has mainly classified it as an abusive drug.

https://www.webmd.com/a-to-z-guides/medical-marijuana-faq