McKinsey & Co is under criminal investigation in the United States over allegations that the consulting firm played a key role in fueling the opioid epidemic, with federal prosecutors homing in on its work advising OxyContin maker Purdue Pharma and other drugmakers, three people familiar with the matter said. The consulting firm and the U.S. Justice Department declined to comment. The probe is focused on whether McKinsey engaged in a criminal conspiracy when advising Purdue and other... Read this story