SEATTLE -- Washington state should be conservative in how much legal marijuana it allows to be sold and strict in how it regulates pot advertising.

That's the advice to state regulators from a group of Washington public health and substance abuse prevention organizations.

The Children's Alliance, the Science and Management of Addictions Foundation, and the University of Washington's Innovative Programs Research Group are among those sending a letter Tuesday to the Liquor Control Board, which is developing rules for the pot industry. They drafted the letter in collaboration with the American Civil Liberties Union of Washington, which was a major backer of Initiative 502.

The groups say placing conservative limits on marijuana production will help make sure pot isn't diverted to minors or out of state, and strict advertising limits will minimize exposure to those under 21.

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