Overview

• The 6-3 decision affirms Delilah Guadalupe Diaz's conviction for smuggling methamphetamine across the U.S.-Mexico border.
• The majority opinion, written by Justice Clarence Thomas, stated that general testimony about drug couriers did not violate evidence rules.
• Justice Neil Gorsuch, in dissent, warned that the ruling grants prosecutors a potent new tool for securing convictions.
• Diaz's defense argued the expert testimony improperly suggested she knew about the drugs in her car.
• The ruling highlights ongoing legal tensions around the admissibility of expert testimony in federal criminal cases.