In a conspiracy to manufacture methamphetamine trial in Washington State, evidence of methamphetamine manufacturing by Bishop obtained in an unreasonable traffic stop a year earlier in Oregon was admitted. It consisted of a large flask with white residue, a pump used in methamphetamine laboratories,and a glass funnel. The vehicle was stopped because it had no front license plate, and the People conceded this was illegal uner U.S. v. Twilley (9th Cir. 2000) 222 F.3d 1092. The court rejected the contention the error was harmless, noting it was powerful corroboration of the testimony of the two prosecutorial witnesses, and that it showed Bishop had conspired with Youngs (one of the witnesses) to manufacture methamphetamine and established a methamphetamine operation at his home.