Scientific evidence and policy change: lowering the legal blood alcohol limit for drivers to 0.08% in the USA.

The United States (US) Centers for Disease Control and Prevention (CDC), and key partners conducted a systematic review of the effectiveness of 0.08% blood alcohol concentration (BAC) laws on alcohol-related traffic mortality. Review findings of strong evidence of effectiveness were presented by partners during US Congressional hearings contributing to the passage of a bill requiring states to lower the legal BAC limit to 0.08% (80 mg of alcohol/100 ml of blood) or lose a portion of their federal highway funds. The bill was signed into law, making 0.08 the new national standard. Extensive and targeted dissemination of the evidence and recommendations to key stakeholders and partners built support for policy change at the state level.