GUADALAJARA, Mexico – The historic seizure of 15 tons of pure methamphetamine in western Mexico, equal to half of all meth seizures worldwide in 2009, feeds growing speculation that the country could become a world platform for meth production, not just a supplier to the United States.

The sheer size of the bust announced late Wednesday in Jalisco state suggests involvement of the powerful Sinaloa cartel, a major international trafficker of cocaine and marijuana that has moved into meth production and manufacturing on an industrial scale.

Army officials didn’t say what drug gangs could have been behind the dozens of blue barrels filled with powdered meth. But Jalisco has long been considered the hub of the Sinaloa cartel’s meth production and trafficking.

There was no information on where the drugs were headed. However, meth use is growing in the United States, already the world’s biggest market for illicit drugs.

The haul could have supplied 13 million doses worth over $4 billion on U.S. streets.

The Sinaloa cartel, headed by Joaquin “El Chapo” Guzman, is equipped to produce and distribute drugs “for the global village,” said Antonio Mazzitelli, the regional representative of the U.N. Office on Drugs and Crime.

“Such large-scale production could suggest an expansion … into Latin American and Asian markets,” Mazzitelli said. But he also noted, “it may be a product that hasn’t been able to be sold, and like any business, when the market is depressed, stockpiles build up.”

A senior U.S. law enforcement official in Mexico said the operation raided in Jalisco was “probably Sinaloa.”