<P> Cannabis was officially outlawed for any use ( medical included ) with the passage of the Controlled Substances Act ( CSA ) of 1970 . Multiple efforts to reschedule cannabis under the CSA have failed , and the U.S. Supreme Court has ruled in United States v. Oakland Cannabis Buyers ' Cooperative and Gonzales v. Raich that the federal government has a right to regulate and criminalize cannabis , even for medical purposes . Despite this , states and other jurisdictions have continued to implement policies that conflict with federal law , beginning with the passage of California 's Proposition 215 in 1996 . By 2016 a majority of states had legalized medical cannabis , and in 2012 the first states legalized recreational use . </P>
<P> Cannabis was officially outlawed for any use ( medical included ) with the passage of the Controlled Substances Act ( CSA ) of 1970 . Multiple efforts to reschedule cannabis under the CSA have failed , and the U.S. Supreme Court has ruled in United States v. Oakland Cannabis Buyers ' Cooperative and Gonzales v. Raich that the federal government has a right to regulate and criminalize cannabis , even for medical purposes . Despite this , states and other jurisdictions have continued to implement policies that conflict with federal law , beginning with the passage of California 's Proposition 215 in 1996 . By 2016 a majority of states had legalized medical cannabis , and in 2012 the first states legalized recreational use . </P>
when was pot made illegal in the us
when was pot made illegal in the us
1970
1970