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Seattle City Attorney Pete Holmes, left, shakes hands with clerk Pam Fenstermacher after purchasing marijuana at Cannabis City, Tuesday, July 8, 2014, in Seattle, on the first day that sales of recreational pot became legal in the state. Washington on Tuesday became the second state to allow people to buy marijuana legally in the U.S. without a doctor's note as eager customers who lined up outside stores made their purchases and savored the moment. (AP Photo/Elaine Thompson, Pool)

SEATTLE (AP) — Seattle City Attorney Pete Holmes acknowledges he broke a drug-free workplace rule when he brought marijuana back to his office after buying on the first day of legal sales in Washington state.

Holmes has been a big supporter of the legal marijuana law, and he says he wanted to be one of the first customers at Seattle's Cannabis City on Tuesday to honor what he called a "tectonic shift" in policy. He says he brought the two unopened packages back to City Hall before taking them home.

The next day, the city's personnel department issued a memo reminding employees they can't have marijuana when they're on official business or at city offices.

Holmes issued an apology Friday and said he volunteered to donate $3,000 to the Downtown Emergency Service Center, an organization that provides housing for alcoholic, mentally ill or otherwise vulnerable people.