FILE - In this Wednesday, June 22, 2011 file photo, Seattle City Attorney Peter Holmes, center, is flanked by campaign director Alison Holcomb, left, and Mark Johnson during a news conference announcing the filing of an initiative to legalize possession of marijuana in Washington state in Seattle. I-502 would legalize up to an ounce of marijuana and create a system of state-licensed growers, processors and retail stores. It was tailored to gain mainstream support: There would be no home-growing, but there would be a DUI standard designed to be comparable to the 0.08 limit for blood-alcohol content. (AP Photo/Elaine Thompson, File)

Associated Press
FILE - In this Wednesday, June 22, 2011 file photo, Seattle City Attorney Peter Holmes, center, is flanked by campaign director Alison Holcomb, left, and Mark Johnson during a news conference announcing the filing of an initiative to legalize possession of marijuana in Washington state in Seattle. I-502 would legalize up to an ounce of marijuana and create a system of state-licensed growers, processors and retail stores. It was tailored to gain mainstream support: There would be no home-growing, but there would be a DUI standard designed to be comparable to the 0.08 limit for blood-alcohol content. (AP Photo/Elaine Thompson, File)
FILE - In this Wednesday, June 22, 2011 file photo, Seattle City Attorney Peter Holmes, center, is flanked by campaign director Alison Holcomb, left, and Mark Johnson during a news conference announcing the filing of an initiative to legalize possession of marijuana in Washington state in Seattle. I-502 would legalize up to an ounce of marijuana and create a system of state-licensed growers, processors and retail stores. It was tailored to gain mainstream support: There would be no home-growing, but there would be a DUI standard designed to be comparable to the 0.08 limit for blood-alcohol content. (AP Photo/Elaine Thompson, File)
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