In labor lawsuits, working hours are the most frequent battlefield, and the electronic timekeeping system is the weapon both sides fight over. The claimant alleges the records do not reflect the real hours; the company presents the timesheets as a faithful portrait. Between the two versions there is a technical object almost nobody truly examines: the timekeeping system, with its original files, its audit trails, and its adjustment records. That is where the forensic examination decides the dispute, and that is where companies and law firms win or lose lawsuits in series.
The timesheet is not the source
The timesheet is a report: the friendly presentation of what the system decided to show. The source is another layer: the raw records generated by the equipment (in the Brazilian standard, the REP time clock and its source data files, such as the AFD provided for in the Ministry of Labor's regulations), the database of the processing software, and the trails that document each intervention. Between the original punch and the final timesheet there can be a whole world: waivers, manual adjustments, rounding rules, disregarded punches. None of this is necessarily unlawful, timekeeping processing exists for that, but all of it must be recorded, justified, and auditable. The examination confronts the layers: what the clock recorded, what the system processed, and what the timesheet tells.
When the layers diverge without justification, the story changes character. Original punches suppressed en masse, adjustments always concentrated in the same direction, shifts edited by the same administrative user outside business hours: patterns like these turn the "too-perfect timesheet" theory into a technical demonstration of manipulation. In the opposite direction, the examination also protects the honest employer: intact records, a coherent audit trail, and processing applied according to internal policy sustain the timesheet against the generic allegation of fraud.
"The timesheet is the official version of the story. The forensic examination reads the draft: the original punches, the adjustments, who edited what. It is in the draft that the truth usually lives."
Mass analysis: case by case, without lazy sampling
The technical differentiator of these examinations is scale. A high-volume labor case involves thousands of punches per worker, years of history, dozens or hundreds of claimants in collective actions. The artisanal answer cannot keep up; the serious answer processes the complete databases with a reproducible method: extraction of the raw data, reconstruction of the timeline of each shift, cross-referencing against the declared processing rules, and statistical identification of anomalous patterns, always with the ability to drill down to the individual case. The report demonstrates both the panorama (what percentage of shifts were adjusted, in which direction, by which users) and the concrete example the court can verify line by line.
The result serves both poles: the claimant's firm finds in the examination the demonstration of suppressed hours; the employer finds the documentary defense against the inflated claim. The technique is neutral; whoever ignores it is choosing to lose.
The cross-checks that reveal the real workday
The timekeeping system is rarely the only witness to the workday. Physical access records (turnstiles, lobby biometrics), authentications in corporate systems, VPN logs, and the timestamps of work emails and messages compose an independent mosaic. When the punch says the employee left at 6 p.m., but the system records intense output until 10 p.m., night after night, the confrontation between the sources becomes the heart of the report. The reverse also appears: the allegation of systematic overtime that the independent records do not support. Independent sources converging: that is always the pattern of evidence that endures.
Home office: the time clock came off the wall
Remote work changed the object of the examination. The punch that used to happen at the lobby clock now happens in a phone app, with geolocation, photo, and authentication, and each of these elements has become forensic subject matter: does the shift punched from home match the recorded location? Was the device the employee's? Are the punch times compatible with actual activity in the systems? At the same time, the remote environment multiplied the parallel sources: VPN sessions, presence in collaboration tools, logs of meeting platforms. For the employer, the lesson is to configure and preserve these trails with the same rigor as the physical clock; for the worker, the good news is that the real home office workday leaves more traces than the old closed office ever did. The examination merely changed address: it left the factory wall and entered the company's digital infrastructure.
What the company should preserve (before it needs to)
- The source files from the timekeeping equipment and the processing software's databases, not just the PDF timesheets;
- The system's audit trails: who adjusted, when, what, and with which justification;
- The timekeeping processing policy in force in each period;
- The parallel access and authentication records for the disputed period;
- All of it for the limitation period, with intact backups: a system replaced without migrating its history is a lost defense.
The electronic timekeeping examination is the perfect example of how labor evidence has become digital evidence. The debate that once belonged to witnesses and cardboard punch cards is now decided in databases, audit trails, and cross-referenced logs, with computer forensics method applied to a classic dispute. Whoever treats working-hours records as bureaucracy discovers their value on the wrong day: when the lawsuit arrives and the only available version of the story is the other party's.
The final yardstick is simple: working hours are a fact, and facts are demonstrated. The rest is narrative waiting for the examination that confirms or dismantles it.
