First the White House, now Congress — or close to Congress, anyway.

Capitol Police said Wednesday the agency was investigating how a small bag that tested positive for cocaine wound up in its headquarters, located about a 10-minute walk from where the House and Senate meet.

The one-inch by one-inch zip-locking baggie containing a white powder was found on a hallway floor near offices that deal with Crime Scene, Intel and Reports Processing, officials said in a statement.

“The hallway is on the second floor in an area that has been a staging spot for furniture and supplies,” USCP helpfully added.