Drug money has a way of sprawling. And some of it may have reached Bank of America.

A federal probe into Los Zetas, a Mexican drug cartel, claims that the group has been laundering money through accounts at BofA,

An FBI affidavit filed in Texas last month says that the Mexican drug cartel has been reportedly funneling cash through a Texas-based racehorse business with BofA accounts. The U.S. government has described Los Zetas in the past as "the most technologically advanced, sophisticated and dangerous cartel operating in Mexico." Tremor Enterprises LLC, the horse business, was for its part allegedly run by Jose Trevino Morales, a U.S. citizen with two brothers in Los Zetas