In May 2019, Denver, Colorado, became the first city in the United States to decriminalize psilocybin mushrooms after an ordinance was admitted to the ballot, and narrowly won with 50.6% of the vote. The initiative did not actually legalize mushrooms, but does prohibit Denver from spending any resources to prosecute people for their use or possession. The law applies to adults over the age of 18, and psilocybin remains illegal in Colorado. In June 2019, Oakland became the second US city, in January 2020, Santa Cruz the third, and in September 2020, Ann Arbor, Michigan, the fourth US city to decriminalize psilocybin mushrooms by passing resolutions to end criminal penalties for use and possession of psilocybin. In November 2020, the state of Oregon became the first U.S. state to both decriminalize psilocybin and also legalize it for therapeutic use.