On 24 May 2012, the Mexican military raided the house and workplace of the Mexican businessman Napoleón Rodríguez de la Garza in Matamoros, Tamaulipas. Rodríguez was the treasurer of Yarrington during his time as mayor of Matamoros and the straw man purchaser of the condominium in South Padre Island, Texas. The condo was bought under Rodríguez to avoid detection from federal agents, but prosecutors believe Yarrington is the actual owner. They also allege that Yarrington gave the money back after Rodríguez bought the $450,000 condo and that Yarrington pays the annual taxes and fees for maintenance. In addition, Rodríguez is believed to have assisted Yarrington during his political campaigns and received contracts to supply Matamoros and the state of Tamaulipas with supplies from his hardware company. Rodríguez was taken to SIEDO for further questioning; he was detained by the PGR on 28 May 2012 and will remain under custody for 40 days. Nonetheless, he accepted to be a straw purchaser for Yarrington. The U.S. authorities began the investigation of other functionaries that worked for the ex-governor of Tamaulipas and close associate of Yarrington, Eugenio Hernández Flores. According to government reports, a man known as Alberto Berlanga Bolado – owner of the GMC, SA de CV and former functionary during Hernandez's time in office, was linked to money laundering and bribes from the Gulf cartel on 26 May 2012. Berlanga's construction company was one of the most prominent during Hernández's governorship, and served as the major contract seller for public works at a state and federal level. During the investigation, the DEA raided an office with the insignias "GMC" in San Antonio, Texas the night of 22 May 2012.