The investigation into the historical writings of Jordan Bardella by the French press site Médiapart has brought attention to the methods used in digital forensics and the admissibility of digital evidence. This process involves techniques used by IT departments to investigate incidents, analyze metadata such as email headers and timestamps, and verify the integrity of digital files to prevent forgery or identity impersonation. For Chief Information Officers (CIOs), the case highlights the importance of maintaining log journals and preserving heritage data, which can be crucial in internal audits, legal disputes, or commercial conflicts. For lawyers and the Data Protection Officer (DPO), the investigation demonstrates how the right of access to personal data under the General Data Protection Regulation (GDPR) can be used as a legal tool, supported by certification from a third party like a justice commissioner or bailiff to ensure the principle of non-repudiation. For those working in open-source intelligence (OSINT) and threat intelligence, the case shows how digital identity attribution, matching of digital fingerprints, and the reconstruction of historical records from public web archives can be carried out. Faced with accusations of "gross falsifications" or "delirious statements" from the political figure under investigation and his party's officials, the journalists focused on ruling out the possibility of deepfakes. Instead of relying on simple screenshots, they asked their source to request Meta on August 16, 2026, using the European right to the protection of personal data (GDPR) to obtain the complete archive of the individual's conversations from 2013. The compressed file generated by the platform ensured that the Messenger conversation used by the journalists had not been altered after its creation. The extraction of the archive was then certified by a bailiff's report to give it uncontested evidential weight. This process was also applied to two separate sources from the political figure's circle, both of whom had independently requested data from Meta's servers. This allowed the journalists to use statements published by the account. The investigation also relied on the analysis of original office documents and emails to verify the timeline of events. For two Gmail addresses used by the individual at the time, the investigation focused on the raw structure and headers of the original messages received from the sources. The analysis of emails enabled precise tracking of sends, such as an email from 2014 containing the PDF of a book, which linked Jordan Bardella to an extreme-right office. Regarding office documents, a file listing members of the National Front for Youth (FNJ) had a metadata creation date fixed at October 16, 2012. The authenticity of the document was further supported by the initial transmission email, providing technical proof that the file could not have been altered later. Additionally, the journalists requested the citizen platform Avaaz to provide the native link of a petition launched on July 11, 2013, by a profile "Jordan B.", corroborating a message from the young activist at the time. Technically linking a social network profile or digital identifier to a physical person requires cross-referencing consistent biographical and network indicators. In the Messenger conversation, the user provided identifiable personal details, such as stating that "My mother was born in Italy, my father in France," or his failure in the Sciences Po entrance exam in 2013. These details were later reaffirmed in his autobiography published in 2024. The extraction history also showed the creation of a second Facebook account dedicated to public life on November 24, 2013, where the author wrote to his interlocutor: "I dedicate this account exclusively to the FN, the other will remain a personal account." Finally, the investigation cross-referenced account identifiers with digital traces on other platforms, such as an anonymous Twitter account (2015–2017) or likes on Instagram up to June 2020 on the private account of an extreme-right activist.