08/29/2013: Department of Justice announced it will not challenge state legalization efforts.
08/12/2013: Department of Justice changed policy regarding mandatory minimum sentences for drug offenders.
06/06/2013: Vermont decriminalized marijuana possession.
05/28/2013: Colorado governor signed bill regulating recreational marijuana.
05/17/2013: Illinois Senate approved medical marijuana bill.
04/23/2013: Supreme Court ruled marijuana possession not grounds for automatic deportation.
04/08/2013: Maryland Senate approved medical marijuana bill.
02/08/2013: Michigan Supreme Court ruled private sale of medical marijuana is illegal.
01/22/2013: Federal appeals court declined to change marijuana drug classification.
12/03/2012: Arizona judge cleared way for marijuana dispensaries.
11/06/2012: Washington and Colorado legalized marijuana in state ballot initiatives.
09/11/2012: Montana Supreme Court found no constitutional right to medical marijuana use.
06/24/2011: US lawmakers introducted bipartisan marijuana legalization bill.
10/19/2009: Department of Justice directed prosecutors to end raids on medical marijuana facilities.
07/31/2008: California court ruled that state medical marijuana program does not violate federal law.
06/06/2005: Supreme Court ruled that Congress has the power to criminalize the growth and use of marijuana for personal medical reasons.