The Canadian government and lumber industry dispute this assertion, based on a number of factors, including that Canadian timber is provided to such a wide range of industries, and that lack of specificity makes it ineligible to be considered a subsidy under U.S. law. Under U.S. trade remedy law, a countervailable subsidy must be specific to a particular industry. This requirement precludes imposition of countervailing duties on government programs, such as roads, that are meant to benefit a broad array of interests. Since 1982, there have been four major iterations of the dispute.