Why the Supreme Court just handed a big victory to gun manufacturers

Weapons seized from members of the gang Los Zetas are displayed by police during a presentation to the press, in Mexico City. | Luis Acosta/AFP via Getty Images

The Supreme Court handed down a unanimous opinion on Thursday that shuts down a lawsuit brought by the nation of Mexico against US gun companies. 

In Smith & Wesson v. Estados Unidos Mexicanos, Mexico sued seven American gun manufacturers, claiming that their products are often sold to gun traffickers who then provide these guns to Mexican drug cartels.