A woman traveling by bus from Los Angeles to New York was arrested in Missouri after being caught with 1.5 million “lethal doses” of fentanyl, federal authorities said.

Evelyn C. Sanchez, 33, was charged Wednesday in US District Court in Kansas City with possessing fentanyl with intent to distribute after being stopped at a Kansas City bus station on Tuesday. Detectives at the station who interviewed Sanchez then got suspicious that she wasn’t being honest as to why she was headed to New York, Department of Justice officials announced Wednesday.

A K-9 then alerted investigators to a suitcase near where Sanchez had been sitting and she acknowledged that it belonged to her. A subsequent search of the suitcase revealed two bundles of fentanyl wrapped in several layers of plastic that weighed in excess of 5 pounds, federal authorities said.

That amount of fentanyl, an opioid with an extremely high risk for addiction, could translate to 1.5 million deadly doses, according to DEA St. Louis Division Special Agent in Charge William Callahan.

“We task these interdiction groups with an increasingly difficult task … to seize drugs before they hit the streets of our communities,” Callahan said in a statement. “Today, they made an impact. They kept this poison out of our neighborhoods and potentially saved countless lives.”

Sanchez remained in federal custody pending a detention hearing, which had yet to be scheduled as of Wednesday, Department of Justice officials said.