The DEA's data on the gangs in Mexico is quite comprehensive, at least for the larger gangs it should be all there. But it's uncertain if Hank, the Senior Agent, can access those specific documents, as some of them are highly classified and only visible to agents on designated missions.
However, this so-called Carlos Escobar doesn't seem to belong to those types of gangs. Hank reacted immediately when he heard Wendy mention the name, indicating that he has a substantial portion of Juarez's gang data in his head.
Hank's investigation probably isn't going very smoothly. Jimmy and the others waited until the afternoon before Hank called Jimmy and met them at the café they were staying at. Luckily, Jimmy and his group didn't just sit for hours with a single coffee, since as long as they were customers, they wouldn't be kicked out.
