June 5 (UPI) -- The U.S. Supreme Court unanimously ruled Thursday against a lawsuit filed by Mexico that accuses seven American gun manufacturers and one wholesaler of unlawful sale practices, and arming drug dealers. "The question presented is whether Mexico's complaint plausibly pleads that conduct. We conclude it does not," wrote Justice Elena Kagan in the opinion of the court . Mexico filed suit in March against a group of companies that includes Smith & Wesson, Beretta, Colt and Glock,