An American attorney preparing for cross-border litigation contacts a private investigator in Mexico City. She needs a police report from a traffic collision in Guadalajara, background checks on two witnesses in Queretaro, and confirmation that a criminal complaint was filed in Oaxaca. She assumes — because this is how it would work in the United States — that a single law enforcement agency holds these records and that a straightforward request will produce them.
She is wrong on every count. The traffic report is held by the municipal transit police in Guadalajara, a force that operates independently of the state police in Jalisco. The criminal complaint was filed with the state attorney general's office, not the police, and is processed through Mexico's ministerial investigation system — a structure that has no direct equivalent in the US. The background checks require navigating federal databases that are separate from both state and municipal systems, and that respond to different request protocols depending on the type of record sought.
The attorney has not made an error of judgement. She has made an error of framework. She has applied an American understanding of policing — in which a county sheriff's office, a city police department, and the FBI represent a relatively coherent hierarchy — to a country whose law enforcement structure is fundamentally different in design, jurisdiction, and operational culture.
This framework error is not trivial. It is the single most common reason that cross-border legal matters, insurance investigations, due diligence processes, and corporate risk assessments involving Mexico produce incomplete results, delayed timelines, and occasionally catastrophic misunderstandings about what the evidence actually shows.
A System Designed Differently
Mexico's law enforcement apparatus operates across three constitutional levels — federal, state, and municipal — but the resemblance to the American federal-state-local model ends at the vocabulary. The structural logic is different, the jurisdictional boundaries are different, and the investigative authorities are different in ways that matter enormously to anyone relying on Mexican law enforcement records for legal, commercial, or insurance purposes.
At the federal level, the dominant force since 2019 has been the Guardia Nacional — the National Guard — established under President Lopez Obrador as a consolidation of the former Federal Police, Military Police, and Naval Police. The Guardia Nacional handles organised crime, border security, drug trafficking, cybercrime, protection of strategic infrastructure, and environmental enforcement. In 2022, its command was transferred from civilian authority to the Secretariat of National Defence, a move that further integrated it into Mexico's military structure while it nominally retains civilian law enforcement status.
This is not the American National Guard. It is not a reserve force activated during emergencies. It is Mexico's primary federal policing body, operating permanently across all thirty-one states and Mexico City, with specialised units for maritime security, cyber policing, border control, and natural resource protection. Understanding what the Guardia Nacional does — and, critically, what it does not do — is the first step in navigating any law enforcement matter that crosses Mexican jurisdictional lines.
What the Guardia Nacional does not do is investigate most crimes. Criminal investigation at the federal level is the responsibility of a separate body: the Agencia de Investigacion Criminal, the investigative arm of the Attorney General's Office. This distinction — between the policing function and the investigative function — is one of the most important structural differences between Mexican and American law enforcement. In the US, a police department both patrols and investigates. In Mexico, the patrol function and the investigation function are separated institutionally, and the records they produce are held in different systems, under different authorities, with different access protocols.
Thirty-One States, Thirty-One Systems
Below the federal level, each of Mexico's thirty-one states operates its own police force under the authority of the state governor. These state police forces — the Policia Estatal — handle regional crime, highway safety, intelligence gathering, and rapid response to emergencies. They are organised into specialised divisions that vary by state: road patrols, investigative units, reaction forces for violent incidents, and procedural police who manage security within the judicial system.
The variation between states is not cosmetic. A state police force in Nuevo Leon operates with different resources, training standards, equipment, and institutional culture than one in Guerrero or Chiapas. The quality and availability of records differ accordingly. A police report filed in one state may contain detailed forensic information; the same type of report in another state may contain only a narrative summary. For an American attorney or insurer relying on these records, the assumption that a mexican police report is a standardised document — comparable to a US incident report — can lead to serious evidential gaps.
State-level investigation is handled by the fiscalia — the state attorney general's office — not by the state police. This is the ministerial system: when a crime is reported in Mexico, it is reported to the ministerio publico, and the investigation is conducted by ministerial police operating under prosecutorial authority. The state police may have been first on the scene, but the investigation belongs to a different institution. For cross-border matters, this means that requesting "the police file" on an incident may produce the wrong records from the wrong agency, because the file the American client actually needs is held by the fiscalia, not the policia.
Municipal Police: First Responders, Limited Authority
At the most local level, Mexico's municipal police forces handle community policing, traffic enforcement, minor civil disturbances, and first response. There are over two thousand municipal police forces in Mexico, and their capabilities range from professional, well-equipped urban departments to understaffed rural units operating with minimal resources.
Municipal police in mexico do not, as a rule, conduct criminal investigations. Their authority is preventive and responsive: they maintain order, direct traffic, respond to calls, and detain suspects for transfer to the appropriate investigative authority. This is a critical distinction for anyone attempting to trace the handling of an incident through the Mexican system. The municipal officer who responded to a bar fight in Cancun is not the person investigating the assault. The investigation was handed to the state fiscalia. The municipal officer's report documents the response, not the investigation. These are different documents, held by different institutions, and they serve different evidentiary purposes.
For the approximately thirty-six million Americans who visit Mexico annually, and for the thousands of US businesses operating across the border, this distinction matters every time an incident generates paperwork. The document you think you need and the document you actually need are frequently held by different agencies — and knowing which agency holds which record is the difference between a complete file and a useless one.
The Ministerial System: Where Investigation Actually Happens
The structural feature of Mexico's police system that most confuses American professionals is the separation of policing from investigation. In the United States, a detective is a police officer with investigative authority. In Mexico, the investigative function belongs to the ministerio publico — the public prosecutor's office — and is carried out by ministerial police who report to prosecutors, not to police commanders.
When a crime is reported in Mexico, the victim files a denuncia with the ministerio publico. This initiates a carpeta de investigacion — an investigation file — that is controlled by the prosecutor's office, not by any police force. The ministerial police conduct interviews, gather evidence, and execute court orders under prosecutorial direction. The state or municipal police who may have responded to the initial incident have no authority over the investigation once it is transferred.
This means that the most important law enforcement records in any Mexican criminal matter — the investigation file, the forensic reports, the witness statements, the chain of custody documentation — are held by the fiscalia, not the police. An American attorney who requests records from the police department is requesting the wrong documents from the wrong institution. The police hold the response record. The fiscalia holds the investigation.
For insurance adjusters, this distinction is equally consequential. A claim arising from an incident in Mexico requires documentation that establishes what happened, who was involved, and what the official findings were. If the adjuster obtains only the municipal police response report — which documents arrival time, scene description, and initial observations — they are missing the investigative file that contains the actual findings of fact. The claim file is incomplete, and the adjuster may not know it.
The Federal Police That No Longer Exists
One of the more persistent sources of confusion in cross-border work is the continued reference to the mexican federal police — the Policia Federal — as though it still exists as an operating force. It does not. The Policia Federal was formally dissolved in 2019 when its personnel and functions were absorbed into the Guardia Nacional. Legacy records from cases that the Policia Federal handled before 2019 are now held within the Guardia Nacional's administrative structure, but accessing them requires knowing that the institutional identity changed and that the request must be directed to the successor agency.
This matters more than it might seem. A US attorney conducting a background investigation on a Mexican national might search for records under "Policia Federal" and find nothing — not because the records do not exist, but because the agency that created them no longer exists under that name. The records are there. The institutional address has changed.
Similarly, references to the mexico federal police in American media, legal filings, and corporate risk reports frequently conflate the former Policia Federal with the current Guardia Nacional, or confuse either one with the Agencia de Investigacion Criminal. These are three distinct entities — one defunct, one operational as a patrol and security force, and one operational as an investigative body — and conflating them produces requests that go to the wrong place, produce the wrong records, or produce nothing at all.
What the American Client Actually Needs
The most valuable thing a US attorney, insurer, or corporate risk manager can understand about police mexico is that the system was not designed to resemble the American one, and that applying American assumptions to it will produce American-shaped gaps in the evidence.
The policing function and the investigative function are separated. Federal, state, and municipal agencies hold different records under different authorities. Criminal complaints are filed with prosecutors, not police. Police reports document response, not investigation. The federal police force that Americans read about for two decades was dissolved in 2019 and replaced by a militarised national guard that operates under defence ministry command. Private investigation is regulated at the state level, requires licensing, and operates within a legal framework that differs from American norms in ways that affect what an investigator can legally do and what evidence they can legally obtain.
None of this makes the Mexican system impenetrable. It makes it different. And the difference, once understood, becomes navigable — provided the person navigating it understands the structure from the inside rather than projecting an American framework onto it from the outside.
This is the operational context in which licensed private investigation in Mexico functions. A qualified private investigator in Mexico is not simply a local pair of eyes. They are a translator — not of language, although that matters too, but of system. They understand which agency holds which records, how to request them within Mexican legal frameworks, how to verify their authenticity, and how to present them in formats that American attorneys, insurers, and corporate clients can use.
Fahad Hizam alHarbi, a federally licensed private investigator based in Mexico since 2019, has built his practice around this translation function. Holding certifications including CAMS (anti-money laundering), CFCS (financial crimes), CFI (fraud investigation), and APP (ASIS International), and currently completing a Master's in Criminal Justice at the University of West Florida, Hizam works primarily with US law firms, insurance carriers, and corporate clients on matters that require navigating Mexico's multi-layered law enforcement and judicial systems. His site publishes source-based reference guides on Mexican policing, criminal justice procedure, fraud risk, and investigative law that serve attorneys and compliance professionals working cross-border cases.
The attorney who made those three calls at the beginning of this article eventually got her records. It took a licensed investigator who knew which doors to knock on, a clear understanding of which agency held which piece of the puzzle, and eight weeks instead of the two she had initially budgeted. The delay cost her client money. The knowledge she gained will save the next one.