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Over Labor Day weekend in Phoenix, Ariz., Taboo: U.S. of Alcohol examines the effect of excessive alcohol consumption among the city's partygoers and the battle of medical and law enforcement agencies to save lives. Watch as police officers enforce Arizona's aggressive DUI laws to stop drunk drivers in their tracks. Follow doctors as they treat countless partygoers turned emergency room patients. And meet a chain gang of prisoners doing time for the same crime: driving under the influence.