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Washington’s rules take effect in one month, and the state plans to begin accepting license applications Nov. 18.

Under Colorado’s rules, businesses must use a state-run online inventory tracking program to document the plant’s journey from seed to sale. Recreational pot stores won’t be allowed to advertise to people under 21.

Marijuana shops are set to open in Colorado in January but only in a handful of cities that have voted to allow them, including Denver.

The federal government announced earlier this year that it would not sue states over plans to tax and regulate marijuana sales for adults over 21, provided they address eight federal law enforcement priorities, including keeping pot off the black market and away from kids.

Washington’s legal marijuana law includes zoning requirements keeping the businesses away from schools, parks and playgrounds.