A US Justice Department lawsuit states that Walgreens processed prescriptions that were either medically unnecessary or invalid.

The Justice Department filed a lawsuit against Walgreens accusing the drugstore giant of filling millions of illegitimate prescriptions across the country since 2012.

The Department of Justice sued Walgreens Boots Alliance Inc. for allegedly dispensing opioids and other controlled substances at pharmacies across the US while ignoring red flags that the prescriptions were likely illegal.