The US Secret Service is investigating how cocaine was found at the White House on Sunday night, with visitor logs and footage combed for clues.
The discovery in the West Wing, which contains the Oval Office and other working areas for presidential aides and staff, led to a brief evacuation.
Secret Service agents found the powder during a routine inspection in an area that is accessible to tour groups.
President Joe Biden and his family were at Camp David in Maryland at the time.
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