The National Post reports in its Saturday edition that marijuana has been legal in Washington State since 2014, and next door in British Columbia, Canadians will be able to legally buy and smoke marijuana for pleasure starting in October. A Washington Post item inside the Post says that between them stands the U.S. border, a thin marijuana militarized zone, where the drug remains forbidden by U.S. federal law. U.S. citizens who try to cross back into the United States carrying marijuana bought legally in Canada to states where it is legal to have it could be arrested at the border crossings for possession -- or drug smuggling -- and face stiff fines or years in jail. U.S. customs can ask Canadians whether they have ever used drugs, and if they say yes, they can be barred from entering the U.S. for life. Len Saunders, an immigration attorney with offices in Blaine, Wash., said a lot of Canadians have no idea that Washington State's pot laws hold no sway at the border. He says Canada needs to resolve the matter with the U.S. government and that Prime Minister Justin Trudeau, who admitted to having smoked marijuana in the past, would be ineligible for entry when he leaves office and returns to being a private citizen.