Maryland Republican Gov. Larry Hogan spent $9.46 million in state funding to import 500,000 coronavirus tests from South Korea that turned out to be flawed and weren't used, emails, documents and interviews show.

The failure by the Centers for Disease Control and Prevention to quickly produce a test kit for detecting the novel coronavirus was triggered by a glaring scientific breakdown at the CDC's central laboratory complex in Atlanta, according to scientists with knowledge of the matter and a determination by federal regulators.