In addition to the creation of a black market for drugs, the War on Drugs is argued by proponents of legalization to reduce the workforce by damaging the ability of those convicted to find work. It is reasoned that this reduction of the workforce is ultimately harmful to an economy reliant on labor. The number of drug arrests increases every year. In a poll taken by the Bureau of Justice Statistics between 1980 and 2009, "a 30-year period... rates for drug possession or use doubled for whites and tripled for blacks."