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In Washington State the only people who can legally retail marijuana are required to have a license from the LCB. The LCB strictly controls the location of the retail store as there are major restrictions about where such retail establishments can be placed in order to keep them away from minors. So it would appear that you would not be able to do this. You can read about the requirements and restrictions on the LCB's website When locations are available, licensees compete for the locations through state-sponsored lotteries.
Anyone else selling marjuana without appropriate licensing is committing a felony that will be prosecuted.