The perfect report: anatomy of a document designed to withstand challenge
Everything we have explained throughout this series ends up converging on a single object: the report.
The investigator's licence. Legitimate interest. The limits. Proportionality. The photographs. The videos. Traceability. The future ratification.
It all ends up there.
The report is the final product of a private investigation, and when the matter reaches the courts, it becomes the piece that will make it possible to reconstruct what happened, who observed it, and how the evidence was obtained.
The LEC expressly recognises reports prepared by legally licensed private investigation professionals. And Law 5/2014 devotes its Article 49 to regulating how they must be drawn up.
At Método 3 we start from one rule: the report is written for the client, but drafted with opposing counsel in mind.
Article 49: the legal anatomy of the report
A single report must be drawn up for each service contracted.
It must record the registration number assigned to the service, the client's details, the purpose of the engagement, the means employed, the results, the investigators involved, and the actions carried out.
Every entry serves a function: it makes it possible to reconstruct the investigation.
One service, one report
The law wants there to be one identifiable professional version of the outcome.
Not several parallel accounts tailored to different recipients.
The service may generate annexes, photographs, videos, and supplementary documentation, but the report must retain its unity.
That protects the subject of the investigation, the client, and the investigator.
An omission is not a cosmetic detail
A report failing to meet one of Article 49's requirements does not necessarily mean its entire content is automatically voided.
The procedural assessment will depend on the nature of the defect.
But the legal requirements are not irrelevant. The Act itself classifies as an infringement the total or partial omission of the data the report must mandatorily contain.
Form does not replace substance, but rigorous form protects substance enormously.
Only what relates to the assignment
Article 49.2 probably contains the best drafting rule in the entire Act.
The report must include only information directly related to the object and purpose of the investigation contracted.
An investigator may come to learn many things during an investigation. That does not mean they should write them down.
A good report does not demonstrate how much we know. It demonstrates exactly what we needed to find out.
Less information can mean better evidence.
Every unnecessary detail opens up a question: "Why did you investigate this?"
The report must survive independently of the investigator's memory
Proceedings take time.
An investigation carried out today may not reach trial for two or three years.
That is why the report must allow the work to be faithfully reconstructed without relying solely on memory: date, time, place, start and end of the surveillance, movements, conduct, duration, those involved, incidents, and recordings.
The report also functions as the contemporaneous record of the investigation.
Article 380 LEC turns every sentence into a future question
When the facts in the report are not acknowledged, its author may be questioned as a witness.
Beforehand, they prove their licence, acknowledge the report, and ratify it.
And the examination is limited to the facts recorded.
This turns drafting into a procedural decision.
What was not properly documented will be difficult to reconstruct later. And what was written gratuitously can turn into an awkward question.
The report is the future perimeter of the investigator's testimony.
Facts, not conclusions
Wrong: "The subject carries out a work activity incompatible with their incapacity."
Better: "At 11:42 a.m. they carry six boxes, one after another, from the establishment to a vehicle parked twenty metres away, lifting them with both arms and placing them in the boot."
The first sentence contains a conclusion. The second contains facts.
It will be the lawyer who argues its meaning, a doctor who assesses its clinical relevance if necessary, and the court that decides.
The investigator gains credibility precisely by not trying to take any of their places.
Whoever saw it must be identified
Article 49 requires recording the investigators involved and the actions carried out.
If several investigators took part, it must be clear who made each observation, who took the photograph, who continued the surveillance, and who heard a particular statement.
The trial then arrives, and each professional should essentially be able to answer for what they directly perceived.
The report and the recordings are not the same thing
The report describes the investigation. The recordings provide visual or audio proof of part of what is described.
An isolated photograph may lack context. The report provides the time, place, sequence, and circumstances.
But the report should not become an excuse to neglect the originals either.
If a relevant recording exists, it must be preserved in a way that allows it to be identified and examined when appropriate.
Chain of custody? Yes, properly understood
The expression comes particularly from the criminal sphere and from the preservation of physical evidence.
In private investigation, it is very useful, but it should not become a ritual mechanically imported wholesale.
A detective's photograph does not necessarily need the same formal procedure as a biological sample seized by the judicial police.
What it does need is sufficient traceability: where it came from, who obtained it, how it was preserved, what happened to the file, and why we can maintain that it corresponds to the action described.
Preserving the original and digital integrity
In digital evidence there is a rule: preserve the native file.
Photographs may be inserted into the report, and videos may be trimmed to make them easier to view, but the original must be properly preserved for as long as there is a legal obligation or procedural need to do so.
Cryptographic systems add another layer. A hash makes it possible to check whether a file has changed since its fingerprint was calculated.
But integrity does not mean authenticity. A hash proves the file did not change from that moment on; it does not, on its own, prove that the scene is genuine.
That is why technology complements the investigator. It does not replace them.
Documenting transformations
If a two-minute clip is used from a forty-minute video, that can be done, but the original sequence must be preserved and the extraction must be explicable.
The same applies to format conversions, compression, frame captures, or versions embedded in a PDF.
Legitimate transformation is not fraudulent manipulation.
What is problematic is being unable to explain what was done.
Authenticating the report itself
It may also be disputed whether the PDF submitted corresponds exactly to the report originally delivered.
Electronic signatures, timestamping, cryptographic fingerprints, or verification codes can make it possible to check integrity.
In an era where a document can be altered in seconds, this layer will become increasingly important.
Método 3's four drafting rules
1. Chronology: time, event, movement, location, conduct, and duration.
2. Fact and inference kept separate.
3. Everything necessary, and only what is necessary.
4. Write for cross-examination: "How will this sentence sound when opposing counsel reads it out loud?"
If it sounds exaggerated, it gets changed. If we don't know how to prove it, it gets changed. If it mixes fact and opinion, it gets separated.
Conclusion
The report is not just what gets written once the investigation is over. Procedurally, it is where its second life begins.
The first life happened on the street. The second may happen before a judge.
A good report is legally complete, informationally minimal, factually precise, with identified authors, traceable recordings, and defensible by those who carried out the investigation.
At Método 3 we sum it up like this:
investigating is obtaining the evidence. Writing it up is preparing it to survive.
Related reading on the authenticity of digital evidence and artificial intelligence: «La IA: Asedio a la privacidad», Editorial Tirant Lo Blanch: https://editorial.tirant.com/co/libro/la-ia-asedio-a-la-privacidad-9791370213701
Truth has a method.