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As , Jesus Enrique Rejon Aguilar was traveling in the company of a police officer escorting him to the southeastern state of Campeche when Federal Police detained him in Atizapan de Zaragoza, a Mexico City suburb of several hundred thousand people.

Authorities did not offer many details of the operation in which Mr. Rejon was arrested, but they said that no shots were fired.

Rejon defected from the elite army unite known as the GAFEs in the late 1990s to form the Zetas, a group of gunmen and bodyguards then at the service of boss Osiel Cardenas. Following Mr. Cardenas鈥檚 arrest in 2003 and extradition in 2007, the Zetas began to operate independently from their erstwhile bosses in the Gulf structure, and since 2010, the two groups have been locked into open warfare across much of Mexico.

Rejon is also sought by the United States government, and officials believe he may have had a role in the shooting death of .

Alejandro Poire, the federal government鈥檚 security spokesman, said that Rejon was the third ranking member of Los Zetas, behind only and .

The Rejon arrest follows a series of smaller triumphs by the government against the gang in recent weeks. a man they called the Zetas鈥� leader in Pachuca, the state鈥檚 biggest city, along with 12 other alleged subordinates in late June. On June 25, the arrest of Albert Gonzalez Pe帽a, the group鈥檚 boss in the key Gulf state of Veracruz.

Days later, an alleged in San Fernando, Tamaulipas was arrested in Veracruz as well.

Tough to beat

that of the original founders of the Zetas, only Lazcano remains, with all of the remainder either dead or in prison. But recent successes notwithstanding, any triumphant tone is a little out of place, because the Zetas remain one of the most dangerous gangs in Mexico, and it's not yet clear that the arrests have significantly limited their room to operate.

In fact, the government has been making similar claims for years, despite the steadily growing menace of the Zetas. The government has made similar comments for several years, as Luis Astorga detailed in his 2007 book, "." In 2006, for instance, , based on an army general鈥檚 comments, that the 鈥淶etas are now just a myth.鈥�

This dynamic of government pressure coupled with continuous rejuvenation demonstrates the adaptability of this group in particular, and of the Mexican drug trade in general.

Even having lost the majority of their elite founders, and a large portion of their initial reinforcements from the Mexican military (a group that includes Trevi帽o), the Zetas have replenished their ranks, recruiting from local gangs in the cities where they operate. They have linked up with American gangs like the Mexican mafia and MS-13 so as to improve their capacity to vault drugs across Mexico鈥檚 northern border, and have retained much of their territory despite fighting with the Gulf Cartel.

Changing the game

Perhaps more than any other gang, the Zetas have also changed the business model for the Mexican criminal organization, branching out from drug trafficking and into extortion, kidnapping, and pirate merchandise. They have also spread from their initial turf in Mexico's northeast to the Yucatan Peninsula and parts of Mexico's Pacific coast region.

In addition, the Zetas have expanded internationally, becoming arguably the strongest gang in .

There, the Zetas have deepened links with Guatemalan ex-military personnel known as Kaibiles, and have taken over key regions like Alta Verapaz and Peten, who worked for a rival of the Zetas.

All of this indicates that the Zetas are far more than just their founding members or leadership cohort, and even the capture of Lazcano and Trevi帽o would likely not be enough to eliminate the group.

--- Patrick Corcoran is a writer for , which provides research, analysis, and investigation of the criminal world throughout the region. Find all of his research .