Medical diagnostic firm PerkinElmer Inc. faces a federal investigation into the company’s role in an alleged Medicare fraud involving tens of thousands of unnecessary genetic cancer tests, according to three sources with knowledge of the probe and documents reviewed by Reuters.

Federal authorities charged 10 former National Football League players for allegedly defrauding a healthcare program of more than $3.4 million by filing false claims for expensive medical equipment.

Dozens of medical professionals in Appalachia – a region hard-hit by the U.S. opioid crisis – were charged with writing hundreds of thousands of illegal prescriptions and committing health care fraud, federal prosecutors said.