The US State Department issued a finding Sept. 7 that former Mexican president Ernesto Zedillo, now teaching at Yale University in Connecticut, should be immune from a civil lawsuit brought against him in the US in connection with the 1997 massacre at Acteal hamlet in Mexico's conflicted southern state of Chiapas. "The complaint is predicated on former President Zedillo's actions as president, not private conduct," said Harold Hongju Koh, a State Department legal adviser and a professor at Yale Law School, also citing the complaint's "generalized allegations." The US Justice Department submitted the letter to federal District Court in Hartford, where a judge is to make the final determination. "We are extremely disappointed by the decision of the Department of State to grant immunity to the ex-president, which will prevent us from proceeding with the case against him," attorneys Roger Kobert and Marc Plugiese of the firm Rafferty, Kobert, Tenneholtz & Hess told Notmex news agency.

The Mexican daily La Jornada reported on Aug. 28 that the two US agents wounded in a shooting incident near Tres Marías in Morelos on Aug. 24 were from the Central Intelligence Agency (CIA), not the Drug Enforcement Administration (DEA). Citing unidentified "official sources close to the investigation," the newspaper also said the attack was carried out by five vehicles, not four, and that the shooting began after the assailants were able to see the victims close up. The agents were driving a heavily armored US embassy car, a Toyota Land Cruiser, on their way to a Navy training facility, apparently to provide instruction to marines involved in the "war on drugs." According to later reports, the US agents survived only because of the car's armor.

In an unusual and dramatic protest against lax gun control laws in the US, relatives of victims of drug-related violence in Mexico destroyed a .357 Magnum pistol and an AK-47 assault rifle in Houston's Guadalupe Plaza Park on Aug. 27 and buried the remains in cement. The protesters were part of a Caravan for Peace that started a month-long tour of the US in San Diego on Aug. 12 to raise awareness of the US role in a "drug war" that has cost some 50,000 lives in Mexico since the beginning of 2007. The tour is to end in Washington, DC on Sept. 12.

Mexico's 2012 presidential election came to a close on Aug. 31 when the Electoral Tribunal of the Judicial Branch of the Republic (TEPJF) officially declared former México state governor Enrique Peña Nieto the winner of the July 1 vote. One day earlier the tribunal had dismissed charges by the coalition backing center-left candidate Andrés Manuel López Obrador that Peña Nieto's 6.62% lead over López Obrador was the result of fraud, vote buying and media manipulation by Peña Nieto's centrist Institutional Revolutionary Party (PRI), Mexico's ruling party from 1929 to 2000. (La Jornada, Mexico, Aug. 31, Sept. 1)

A group of Mexican federal police agents attacked a US embassy car at around 8 am on Aug. 24 in the state of Morelos just of south of Mexico City, near the Mexico City-Cuernavaca highway. The police agents shot a number of times at the car, lightly wounding two US officials who were traveling with a member of the Mexican Navy to a nearby Navy training installation. The embassy car had diplomatic license plates, while the federal police were reportedly traveling in four unmarked vehicles.

After nearly 10 years of struggle, Mexican campesinos fighting to protect their lands from the planned La Parota hydro-dam on the Río Papagayo won a definitive victory with the Aug. 16 signing of the "Cacahuatepec Accords" by Guerrero's Gov. Ángel Aguirre Rivero and the Council of Ejidos and Communities in Opposition to La Parota Dam (CECOP). Under  the agreement, Aguirre has committed the state not to approve La Parota dam if affected communities do not accept it, if they are not justly compensated, or it will impact the environment—effectively ending the project. Aguirre is also committed to seek an audience between CECOP and Mexican President Felipe Calderón to assure a commitment to the same principles from the federal government. La Parota dam would have flooded  17,000 hectares, impacting some 100,000 local residents. 

According to two members of the US Congress, Reps. Elijah Cummings (D-MD) and Henry Waxman (D-CA), there is evidence that the US-based retail giant Wal-Mart Stores, Inc., didn't take legally required steps to prevent money laundering and tax evasion through its Mexican subsidiary, Wal-Mart de México. The allegation appears in an Aug. 14 letter the lawmakers wrote to Wal-Mart Stores CEO Michael Duke complaining that the company has failed to cooperate with their investigation of a $24 million bribery scandal that emerged in April.

According to an Aug. 4 report in the Wall Street Journal, the US Attorney's Office in Los Angeles is investigating possible money laundering by Chinese-Mexican pharmaceutical entrepreneur Zhenli Ye Gon in the middle 2000s through the Las Vegas Sands Corp. casino company. The company, whose CEO and largest shareholder is US billionaire Sheldon Adelson, a major donor to the Republican Party, reportedly failed to tell the authorities about suspicious money transfers by Ye Gon until the publication of a newspaper article about him in 2007. Adelson himself is apparently not being investigated at this point.