(July 24, 2019, 7:25 AM EDT) -- ST. LOUIS — Fourteen years ago, the Eighth Circuit U.S. Court of Appeals upheld admittance of a federal agent’s expert opinion that drug dealers would not give 5 kilograms of cocaine to someone to deliver who did not know what he was transporting. The same testimony by the same expert to rebut a woman’s “unknown courier defense” received the court’s imprimatur again in a July 18 per curiam opinion that relies on the earlier decision (United States v. Adriana Gutierrez-Ramirez, No. 18-2270, 8th Cir., 2019 U.S. App. LEXIS 21302)....