Disorganised attempts to improve policing in Mexico have led to the slow creep of the army and skyrocketing murder rates. On 31 August 2022 in Nuevo Laredo Tamaulipas, Mexico, Heidi, a four-year-old girl, complained of stomach-ache. It was approximately 10pm when her nanny Graciela decided to drive her and her seven-year-old brother Kevin to the hospital. During the drive, Graciela noticed soldiers on the road, but as that’s common in Mexico, she continued on her way. Suddenly, it sounded as if the car was being hit by hail. When Graciela turned to check the children, Heidi was dead and Kevin injured. Apparently, the soldiers thought that the car contained a group of criminals, instead of a nanny with a pair of children, just because it had tinted windows. Despite evidence, such as the calibre of bullet recovered from Heidi and Kevin, the army refused to acknowledge responsibility. They blamed a criminal group they were targeting at the time. The most alarming part of this story is that it is not an exception. In recent years in Mexico, hundreds of similar tragedies have occurred. Mexico’s armed forces have been involved in law enforcement tasks for decades. But the intensification and mass participation of armed forces in law enforcement began when then-President Felipe Calderón declared a “war on drugs” in 2007. The army, and later the marines, were deployed in states of Mexico with high levels of organised crime. The army’s role in policing expanded from there. The president decided to use the armed forces because Mexican police had a bad reputation for lack of competence and high levels of corruption. During the presidential period of Enrique Peña Nieto (2013-2018), the army slightly reduced its deployment during the three first years, but then restarted and continued with more intensity. Nowadays with current president Andres Manuel Lopez Obrador there is almost double the number of soldiers as when the war on drugs started. Despite the military intervention, the violence has not ceased. In fact, homicides have reached record highs. Studies have linked the deployment of the military to the increasing homicides and shown the army disproportionately uses lethal force during clashes with criminal gangs. In other words, the soldiers have killed people without clear justification. Some specialists, such as political scientist Andreas Schedler, have described the war on drugs in Mexico as a non-international armed conflict or a civil war driven by economic rather than political interests. At the beginning of the war on drugs, the deployment of the army was considered an urgent and temporary measure while police institutions at the three levels of government were reformed. But despite the various efforts at different levels of governments to try to build civil police institutions with a focus on citizen security, the army has played a large role in the transformation of the police institutions. This has led to the increased militarisation of police forces. Military personnel are now in leading positions in police institutions. Training in the use of firearms, self-defense, and strategies against ambush is conducted by military instructors. And police institutions have acquired military vehicles such as Israeli SandCats and use semi-automatic rifles for daily police routines. When Andrés Manuel López Obrador became president, the expectation was that his government would return the soldiers to their barracks and strengthen police institutions. However, the direction that he took was in fact the opposite. Local police forces saw their funds significantly reduced, affecting their ability to be trained, paid professional police officers. The Federal Police was dissolved, and the National Guard was created. It is made up of current soldiers (70 percent) and a lesser proportion of police officers from the former Federal Police (30 percent). According to Mexican law, the National Guard is a civil institution that responds to the Secretaria de Seguridad y Protección Ciudadana, a civilian secretariat. But in practice, the National Guard is an institution under the control of the army. Its commander is a general from the Mexican army. A directive to formally transfer the administrative and operative control of the National Guard to the army was approved at the beginning of September. Today in Mexico at federal level no civil institution exists to serve and protect Mexican citizens. At the same time, the Secretaria de la Defensa Nacional (Ministry of Defence) expanded. President Obrador has given it scope to develop megaprojects like the new international airport and the Maya train and intervene in social policy and environmental protection.