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.