Wanted: A green thumb with extensive knowledge of the black, or at least gray, market.

As Washington state tries to figure out how to regulate its newly legal marijuana, officials are hiring an adviser on all things weed: how it's best grown, dried, tested, labeled, packaged and cooked into brownies.

Those angling for the job were expected to learn more Wednesday in Tacoma. The state Liquor Control Board, the agency charged with developing rules for the marijuana industry, reserved a convention center hall with a capacity of 275 people -- plus an overflow room -- for its bidding experts