Whose authority were the Mexican police under that had a shootout with the CJNG in 2015?
2015 Tanhuato–Ecuandureo shootout:  When they tried to pull over the vehicle, however, the men onboard opened fire at the police units. Federal Police (Mexico): The Federal Police (Spanish: "Policía Federal, PF" ), formerly known as the "Policía Federal Preventiva" (Federal Preventive Police), is a Mexican police force under the authority of the Secretariat of the Interior.
i don't know