Taylor v. United States

holding that “the district court did not commit plain error by admitting expert testimony indicating that the defendant’s actions and the amount of cocaine he was carrying were consistent with possession with ah intent to distribute cocaine” | defendant charged with conspiracy to distribute “a quantity of cocaine in excess of five (5) kilograms in violation of Title 21, United States Code, Section 841(a)(1)”; court held quantity of cocaine not element of the charged crime | discussing general rule and cataloguing cases