One practice that has substantially increased compliance with drunk driving laws is

Question

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Sobriety checkpoints have been found to substantially increase compliance with drunk driving laws by deterring potential drunk drivers from getting behind the wheel. The possibility of being stopped and tested for alcohol consumption can serve as a deterrent and reduce drunk driving incidents. Tax increases and raising the legal drinking age may have some impact on reducing drunk driving, but they are not as effective as sobriety checkpoints. Server liability laws can create accountability for establishments that serve alcohol, but they do not necessarily deter individuals from driving drunk.

One Practice That Has Substantially Increased Compliance with Drunk Driving