The smartphone revolution comes with a hidden cost. A joint investigation by FRONTLINE and ProPublica explores the hazardous work of independent contractors who are building and servicing America's expanding cellular infrastructure. While some tower climbers say they are under pressure to cut corners, layers of subcontracting make it difficult for safety inspectors to determine fault when a tower worker is killed or injured. Also this hour: Nearly four years after the financial crisis, yet another scandal rocks Wall Street. Jon Corzine, former head of Goldman Sachs and political power broker, took over MF Global in the spring of 2010 with oversize ambition and a passion for risk. But after a massive bet on European debt turned sour, the firm lay in ruins, with more than a billion dollars of customer funds missing. FRONTLINE investigates how Corzine's traders went around MF Global's risk officers and how he swayed regulators in Washington to allow risky practices to continue.
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