23-14 - Diaz v. United States - Opinion Announcement - June 20, 2024

A case in which the Court held that in a prosecution for drug trafficking—where an element of the offense is that the defendant knew she was carrying illegal drugs—Federal Rule of Evidence 704(b) permits a governmental expert witness to testify that most couriers know they are carrying drugs and that drug-trafficking organizations do not entrust large quantities of drugs to unknowing transporters.