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FIFE, Wash. (AP) - A judge on Friday is expected hear arguments over whether cities in Washington can ban marijuana businesses that are allowed under state law, in a case that could have big implications for Washington's experiment in legal weed.

A man who wants to open a marijuana store in the Tacoma suburb of Fife has sued the city, saying its ban on pot businesses is not allowed.

The city is defending its right to remain pot-shop free. It says that if the state law doesn't leave room for local bans, then the judge should consider whether the state's entire new system of licensed marijuana growers, processors and stores should be thrown out as incompatible with the federal prohibition on marijuana.

State Attorney General Bob Ferguson calls Fife's arguments a significant threat to legal marijuana in Washington.

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