The Adult Use of Marijuana Act (also known as AUMA or Proposition 64) was a 2016 voter initiative that legalized Cannabis in California. The full name of the measure was the "Control, Regulate and Tax Adult Use of Marijuana Act". A similar initiative was on the ballot in 2010, Proposition 19. It did not pass. The initiative passed with 56% voter approval and became law on November 9, 2016.