Mealey's (February 8, 2019, 1:31 PM EST) -- DENVER — Most opinions by a narcotics detective acting as an expert witness in a drug-trafficking case are admissible for trial, though he cannot opine that the defendant’s ownership of an assault rifle is indicative of drug trafficking, a Colorado federal judge decided Feb. 6 (United States v. Michael Shannon, No. 18-cr-00353, D. Colo., 2019 U.S. Dist. LEXIS 18728)....