But even if federal marijuana prohibition is entirely constitutional and remains on the books, it will be extremely difficult to enforce without the cooperation of state governments. As a practical matter, the federal government has only a very limited supply of law enforcement personnel, and depends heavily on state police and prosecutors for help in waging the War on Drugs. If that assistance is no longer forthcoming in many of the nation's largest states, it is unlikely that Washington will ramp up its own enforcement efforts enough to compensate — especially since such action might be very unpopular in the affected states. The growing trend towards legalization at the state level might even incentivize Washington to repeal federal marijuana prohibition entirely.