WASHINGTON, United States (AFP)— The United States (US) Supreme Court on Thursday dismissed a $10 billion lawsuit by the Mexican government accusing American gun manufacturers of fueling drug cartel violence.

In a unanimous 9-0 opinion, the top court said a federal law — the Protection of Lawful Commerce in Arms Act (PLCAA) — shields the gunmakers from liability.

“Mexico’s lead claim — that the manufacturers elect to sell guns to, among others, known rogue dealers — fails to clear that bar,” said Justice Elena Kagan, author of the opinion.

“Mexico’s complaint does not plausibly allege that the defendant manufacturers aided and abetted gun dealers’ unlawful sales of firearms to Mexican traffickers.”

Gunmaker Smith & Wesson and gun distributor Interstate Arms had sought dismissal of the Mexican government’s suit, which has been winding its way through US courts since 2021.

Mexico, which is under pressure from President Donald Trump to curb drug trafficking, had accused the firearms makers of aiding and abetting illegal gun sales because they allegedly know that some of their products are being unlawfully sold to the drug cartels.

A federal judge tossed out the case in 2022 saying Mexico’s claims failed to overcome the protections of the PLCAA, which was passed by Congress in 2005 and shields US gunmakers from liability for criminals misusing their products.

An appeals court revived the case, citing an exception to the law, and Smith & Wesson and Interstate Arms sought relief from the Supreme Court.

In a statement, Mexico’s foreign ministry said it “strongly disagrees” with the Supreme Court’s dismissal of the suit.

The Mexican government “will continue to do everything in its power to curb illicit arms trafficking, exhausting all available legal and diplomatic remedies,” it said.

The National Rifle Association gun rights group welcomed the ruling as a “huge legal win” while Smith & Wesson CEO Mark Smith celebrated what he called an end to “this ridiculous lawsuit against our company.”

– ‘El Jefe’ –
A majority of the justices on the conservative-dominated top US court had appeared to side with the firearms companies during more than 90 minutes of oral arguments in March.

Mexico maintains that 70-90 percent of the weapons recovered at crime scenes have been trafficked from the United States.

The southern US neighbor tightly controls firearms sales, making them practically impossible to obtain legally.

Even so, drug-related violence has seen more than 480,000 people killed in Mexico since the government deployed the army to combat trafficking in 2006, according to official figures.

Catherine Stetson, representing the Mexican government before the Supreme Court, said 600,000 US guns are illegally trafficked into Mexico every year and some companies are even “designing certain guns to target the Mexican market,” giving them Spanish names such as “El Jefe.”

The case comes against a backdrop of US-Mexico trade tensions with Trump threatening tariffs on imports from Mexico, citing a lack of progress in stemming the flow of drugs such as fentanyl into the United States.

Democratic Senator Dick Durbin said the Supreme Court decision does not address the “crisis” of gun trafficking from the United States to Mexico.

“Lawless gun manufacturers, international criminals, and drug cartels are weaponizing our lax gun laws in America to facilitate violence, traffic drugs, and wreak havoc across the globe,” Durbin said in a statement.

“Our fight for common sense gun safety reform continues,” he said, urging his fellow senators to back his “Stop Arming Cartels Act.”