RANCHO CORDOVA, Calif. — Federal agents have arrested a California nurse on suspicion of running an illegal online pharmacy that sold more than 20,000 opioid prescription pills.

The Sacramento Bee reported Sunday that Carrie Alaine Markis of Rancho Cordova was arrested last week and could face charges including distribution and conspiracy. It was not immediately known if she has an attorney.

Prosecutors say the 46-year-old earned tens of thousands of dollars selling drugs via a marketplace on the darknet called Farmacy41.

The newspaper said Markis is identified in court papers as holding a master’s degree in nursing science and health care leadership from the University of California, Davis.

Markis was expected to appear in court Monday.

The US Attorney’s Office in Sacramento has led efforts nationwide to crack down on hidden websites that purport to offer untraceable sales of drugs.