The unanimous ruling (9-0) reinforces a 2005 law, the Protection of Lawful Commerce in Arms Act (PLCAA), which protects gun manufacturers from being held liable for criminal misuse of their products. The legal action claimed that the influx of illegal firearms from the US to Mexico was a result of deliberate marketing practices by gun companies, catering to drug cartels. This ruling reverses an earlier decision by a lower court that permitted the case against several companies, including Smith & Wesson, to move forward. During oral arguments, justices expressed skepticism regarding Mexico's claims, questioning the foundational aspects of the lawsuit, bringing into focus the complexities of cross-border gun trafficking and its implications for both nations.