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The Secret Service said the white powder – believed to be cocaine – was found in a work area in the West Wing of the White House.
A white substance that sparked an emergency evacuation of the White House on Sunday night tested positive for cocaine.
The substance was found in a work area of the secure building during a routine inspection, the US Secret Service said.
The preliminary positive test was first reported by the Washington Post, which cited fire sources and law enforcement.
President Joe Biden and his family were not at Camp David residence when the substance was found.
The White House complex was closed as a precaution around 20:45 local time (01:45 BST) on Sunday after Secret Service officers found white powder “inside a work area”. in the West Wing, Secret Service spokesman Anthony Guglielmi told the BBC in a statement.
Mr Guglielmi said the fire department was quickly called and found the substance was “non-hazardous”.
He did not confirm the preliminary test results, saying that the item has been sent for further testing and an investigation is ongoing, including how the substance entered the White House.
The BBC’s US partner, CBS News, reported a senior law enforcement source as saying that the substance was found in a storage facility in a closet regularly used by White House staff. and visitors to store mobile phones.
CBS reported that two law enforcement officials and a recording of a radio dispatch from Sunday confirmed that the substance tested positive for cocaine after it was found.
Cocaine is a Schedule II drug under the Controlled Substances Act, meaning it has a high potential for abuse, according to the US Drug Enforcement Administration.
The West Wing is a large, multi-level part of the White House that contains the offices of the president of the United States, including the Oval Office and the Situation Room.
It also houses the offices of the vice-president, the White House chief of staff, the press secretary, and hundreds of other staff members who have access.
