A Dallas physician assistant who willingly processed fake prescriptions, a Detroit rehabilitation center owner who submitted false occupational therapy claims and a Maryland executive who bilked taxpayers of more than $7 million are among the latest in the federal government’s lengthening list of successful Medicare and Medicaid fraud prosecutions.

Cal Graves, 31, a physician assistant working at the South Dallas Community Health Center, was convicted in federal court of one count of conspiracy to commit healthcare fraud. He was sentenced to five years in prison, fined $250,000 and required to make restitution to the government.