A federal judge has blocked a Maine law requiring a three-day waiting period to buy a firearm in response to a legal challenge filed by gun dealers who argue the restrictions are unconstitutional. The ruling Thursday by U.S. District Judge Lance Walker sided with the Sportsman’s Alliance of Maine, Gun Owners of Maine and several gun sellers who filed a lawsuit last year alleging the law requiring people to wait 72 hours to acquire a firearm — even if they pass a required criminal background check. Walker's ruling temporarily blocks the law while he considers the legal challenge. "Citizens wishing...