(December 30, 2015, 10:19 AM EST) -- ATLANTA — A trial court did not err in admitting the testimony of a gang expert from California, the 11th Circuit U.S. Court of Appeals ruled Dec. 16, affirming convictions against three members of an alleged gang (United States of America v. Courtney Davis Wilson a/k/a Co Co., et al., No. 12-14449, 11th Cir.; 2015 U.S. App. LEXIS 21756)....