You never fail:
The Secret Service has been investigating since the drug was found near a visitor entrance on July 2.
abcnews.go.com
"Members told reporters the Secret Service informed them they narrowed down the list of suspects to 500 people during the weekend that cocaine was found and said that group included a mix of staffers and visitors who were on a tour. West Wing tours are invitation only.
Members said they were told there are 182 lockers on the wall where visitors are typically told to store their electronics and cell phones. They said they were told the cocaine was found in locker 50."