Reported by: Melissa Correa
"We've listened, through wire taps, and we know the organizations' commanding control cell are talking to commanding control cells in Mexico - directly to the trafficking cartel heads," says Drug Enforcement Agency Agent James Capra.
Capra says the Gulf Cartel, La Familia, and the Sinaloa Cartel all have a presence in Dallas.
"They have familial roots here. Some of them grew up here, have families here, have established networks here," he says.
The drug mules who carried loads in for the cartels are living in Dallas as well. Moises Albino Castillo was one of those mules.
"I traveled as a drug mule three times. I brought in 15 kilos of marijuana on my back two times," he says.
Castillo says he was treated well by the cartel, but he decided not to continue working for them.
"I don't want to. It ends badly. I have too much to live for. It would end with me shot or in prison. No, no thank you," he says.
He's one of the few who walked away. Capra says other people don't turn down the offer.
"We've had illegals. We've had American citizens. You name it, we've had it across the gamut," says Capra.
Capra tells us drug dealers are willing to establish themselves through violence in Dallas.
"We do know that in the past two years, there's been 12 different homicides that we've actually tracked back to drug trafficking groups," he says.
It's all part of the cartels' plans to move their drugs through the Valley to Dallas and then to the rest of America.