Before arriving at the forensic medical service [INCIFO], the trailer that transported the bodies of 56 undocumented Central and South-Americans murdered a few days ago in Tamaulipas crashed, leaving a young woman severely injured. In Mexico City’s Institute of Forensic Science (INCIFO), one of two refrigeration chambers is exclusively used to store migrant remains from San Fernando. Only forensic experts of the national prosecutor’s office (PGR) and the Argentinian Forensic Anthropology Team are allowed in the chamber, their occasional presence indicated by the full-body white suits which they wear when working on these highly decomposed remains. I have no access to these practices. The forensic experts I work with have no access to the chamber. Yet forensic scientists constantly evoke the San Fernando massacres during talks and interviews as a turning point in the country’s history of forensic services: “These events revealed an incompetent state, for the number of victims far exceeded the state institutions’ capacities to deal with the situation”.