Historic as it was, the U.S. Congress passed the Controlled Substances Act in 1970 which placed marijuana in the category of Schedule I substances, the most restrictive of all categories. This meant that it was in contravention of the law of the land to either use, possess or distribute cannabis and any violation would tantamount to criminal penalties.
However, after all these years, it seems that banning marijuana did not do much to curb its usage, addiction and misuse in the country. Realizing this, and the medicinal properties that it is known to possess, many states legalized its use for medical purposes in due course. In fact, some states went a step further legalizing its recreational use as well. As of today, medical marijuana stands legalized in 29 U.S. states and the District of Columbia, of which 10 allow it for recreational purpose also. Read more