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Some Underage Drinking Laws Reduce Drinking-and-driving Fatal Crashes Better Than Others (April 8, 2009) -- Researchers have examined which minimum legal drinking age laws are the most effective in reducing alcohol-related crash fatalities among youth. Four MLDA laws have significant associations with fewer underage drinking-and-driving fatal crashes: possession, purchase, use and lose, and zero tolerance. Three more general laws that target all drivers were also effective: .08 percent blood alcohol concentration illegal per se law, secondary or upgrade to a primary seat-belt law, and an administrative license revocation law. .