The investigation focuses on Meta's platforms, including Instagram and Facebook, for their potential role in drug trafficking.
U.S. prosecutors in Virginia are conducting a criminal grand jury probe into whether Meta's social-media platforms facilitate and profit from drug sales.
The Food and Drug Administration is assisting in the investigation, which includes reviewing records related to illicit drug content on Meta's platforms.
Meta claims to proactively cooperate with law enforcement to combat the sale and distribution of illicit drugs.
Meta has engaged outside entities like LegitScript and the University of Alabama at Birmingham to screen advertisers and content for drug-related violations.
Social-media companies, including Meta, face scrutiny from lawmakers over content that may harm young people, complicating efforts to hold them accountable.
The Justice Department has previously sought to hold internet platforms accountable for illegal activities facilitated through their services.