The U.S. Food and Drug Administration is investigating complaints filed by two former employees of privately held laboratory operator Theranos Inc, the Wall Street Journal reported, citing people familiar with the matter. In September, a complaint filed by a former Theranos employee to the Centers for Medicare and Medicaid Services stated that the management instructed lab employees to continue testing patients with the company’s devices, despite facing accusations that its devices were flawed and had problems with accuracy, the Journal reported.