what year did marijuana become federally illegal
All this is in conflict with federal laws; cannabis is a Schedule I drug according to the Controlled Substances Act of 1970, which classified cannabis as having high potential for abuse, no medical use, and not safe to use without medical supervision.he Marijuana Tax Act of 1937 effectively made possession or transfer of cannabis illegal throughout the United States under federal law, excluding medical and industrial uses, through imposition of an excise tax on all sales of hemp.