Three former executives of medical company Magellan Diagnostics have been charged with concealing a problem with machines that tested lead levels in humans, according to the US attorney’s office in Boston. The machines produced inaccurate, falsely low results affecting tens of thousands of children, among others. Ex-CEO Amy Winslow, former chief operating officer Mohammad Hossein Maleknia and Reba Daoust, previously director of Quality Assurance and Regulatory Affairs, were charged with wire fraud and conspiracy to defraud a US agency by the US attorney’s office in Boston. Winslow earned a bonus of $2m following Meridian Bioscience’s 2016 purchase of Magellan.