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Shocking footage has revealed the scale of Philadelphia's untamed 'tranq' epidemic, which has transformed the city's streets into a drug-infested hellhole. Philly's Kensington neighborhood is known as 'ground zero' for the city's drug crisis, and this is just part of a large drug problem plaguing the U.S. In the latest episode of Facts Tell, let's find out more about the 'tranq' epidemic in Philadelphia, as well as the long history behind America's drug problem.