The Occupational Safety and Health Administration is stepping up its oversight of state safety agencies in the wake of fatal construction accidents in Nevada that exposed issues in state reviews. Roughly half of U.S. states run their own workplace-enforcement agencies, but the federal government is supposed to monitor their work. "It was when we got the results back from [Nevada] and realized how many problems there were that we thought we better take a look at all states," said David Michaels, assistant secretary of labor for OSHA.

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