An undercover Fairfax County Police detective bought cocaine and fentanyl in McLean twice in fall 2025 as part of a federal drug-trafficking investigation, Patch reported, citing federal court records.

The investigation led to charges against Moussa Konte, a Washington, D.C., man accused of possession with intent to distribute 400 grams or more of a fentanyl mixture and 500 grams or more of a cocaine mixture. He was arrested Wednesday, Aug. 26, in Washington.

The charges are allegations. Konte is presumed innocent unless proven guilty.

The case grew out of a joint FBI and Montgomery County Police Department investigation into a cocaine-trafficking conspiracy across Washington and the surrounding metro area. A separate, unnamed person under investigation traveled from Maryland to McLean on Oct. 9, 2025, and sold the Fairfax County detective two ounces each of cocaine and fentanyl for $4,000 in government funds, according to the FBI affidavit cited by Patch.

Lab testing confirmed 61.57 grams of cocaine and 61.43 grams of a carfentanil/fentanyl mixture from that buy. A second purchase on Nov. 18, 2025, again in McLean, yielded 56.07 grams of cocaine and 56.17 grams of a fentanyl mixture for another $4,000.

Investigators linked Konte to the unnamed seller through communications they believed involved drug transactions and a recorded June 23 FaceTime call in which a person believed to be Konte displayed what appeared to be a kilogram-sized quantity of narcotics, according to the filing.

Authorities executed a search warrant at Konte's Washington residence on Tuesday, Aug. 25. Inside, they reported finding about 739 grams of suspected fentanyl pills, roughly 934 grams of suspected cocaine, about three pounds of marijuana, approximately $8,000 in cash, a kilogram press, digital scale, vacuum sealer, money counter, handgun magazines and ammunition.

No arraignment or hearing date has been publicly announced. Anyone with information about drug activity in Fairfax County can contact the Fairfax County Police Department at 703-691-2131 or submit anonymous tips through Crime Solvers at 1-866-411-TIPS.