With recent waves of Central Americans seeking to reach the U.S., human smuggling along the Texas border has, at least for the moment, become more lucrative than smuggling illicit drugs for criminal organizations such as the Gulf and Zetas cartels, according to two U.S. intelligence officials. U.S. agents tracking the money flow as part of the anti-smuggling Operation Coyote say that in just over six months, human smuggling has generated nearly $50 million, mostly in the area around the Mexican border city of Reynosa. The revenue has helped sustain the Gulf cartel during a bloody internal split, the officials said....