In November 2023, the Supreme Court granted certiorari in United States v. Diaz, which raises a question about the admissibility of expert law enforcement testimony offered to support the prosecution’s theory that the defendant knew she was transporting drugs. Here is more about the case.

Background

At 2 a.m. on Aug. 17, 2020, Delilah Guadalupe Diaz was returning from Mexico to her home in California when a border agent discovered almost 25 kilograms of methamphetamine, valued at more than $350,000, hidden in the door panels of her car. Diaz also had two cell phones with her.