Despite an exhaustive investigation by the FBI's state-of-the-art crime lab, no DNA or fingerprints were found on the baggie of cocaine discovered in the White House lobby last week. Surveillance footage from the area has also failed to identify a suspect. As a result, the source of the drugs remains a mystery, according to a synopsis of the Secret Service investigation obtained by The Associated Press.

Secret Service agents came across the illicit substance during a routine White House sweep on July 2. The substance was found in the bustling West Wing lobby, a common space for staff movement and the gathering point for tour groups to deposit personal belongings.

The Secret Service's official summary stated, "Without physical evidence, the investigation will not be able to single out a person of interest from the hundreds of individuals who passed through the vestibule where the cocaine was discovered."

An anonymous insider with knowledge of the ongoing probe postulates that the bag could have been left behind by one of the hundreds of visitors that frequented the building over the weekend.

The unexpected finding of cocaine within the presidential residence triggered a wave of criticism and inquiries from the Republican party, prompting a request for a detailed briefing on the ongoing investigation. White House Press Secretary, Karine Jean-Pierre, highlighted President Joe Biden's emphasis on the urgent need for the Secret Service to unravel the origins of the drugs.

President Biden was away at Camp David with his family during the holiday weekend when the discovery occurred. The immediate response to the find included a temporary evacuation of the complex as a precautionary measure, and the summoning of the fire department to determine the hazard potential of the discovered white powder.

Although the initial assessment dismissed the possibility of a biohazard, it returned a positive result for cocaine. The substance was then forwarded for more sensitive lab scrutiny. This secondary analysis at Homeland Security's National Biodefense Analysis and Countermeasures Center dispelled any biothreat fears.

Further forensic testing, including sophisticated fingerprint and DNA work at the FBI's crime lab, proved inconclusive. Secret Service investigators have since compiled a list of several hundred individuals who could have accessed the area where the drugs were discovered.

However, the inability to yield latent fingerprints or DNA from the lab results has stymied the investigative efforts. As a result, comparisons cannot be made with potential suspects. While White House staff members are fingerprinted, tour group participants are not subjected to this process.

Surveillance video of the lobby entrance failed to identify any individual or provide solid leads, according to the Secret Service. The lobby, often open for staff-led tours during non-working hours and weekends, accommodated tours on the day the drugs were discovered, as well as the two preceding days.

As the saga unfolds, the puzzle of the cocaine discovery at the White House remains unsolved, leaving lingering questions and sparking public debate about security at one of the most guarded places in the world.