Digital evidence and AI: the new battleground in civil litigation

The question is no longer simply whether digital evidence can be formally admitted in the proceedings. The real debate is whether it withstands rigorous cross-examination. A screenshot may serve as evidence, but it is unlikely to carry the same weight as a documented technical extraction, with preserved metadata, demonstrated traceability, and validation by an expert. Similarly, a transcribed conversation, an electronic file, or an image presented without context may prove insufficient if there is no evidence of how they were obtained, preserved, and introduced into the proceedings.

Spanish procedural law provides a flexible framework for the admission of digital media, recordings, and electronic files. However, formal admission does not equate to evidential value. Evidence may be valid from a procedural perspective and yet have limited value if there are doubts about its authenticity, preservation, or integrity. In an increasingly digitized environment, evidence must not only be presented: it must also be explainable, reconstructable, and defensible.

Artificial intelligence raises the bar. In addition to traditional questions of authorship and integrity, there are now more complex issues: whether the content has been generated or altered by AI, whether an automated system has selected or interpreted relevant data, what sources have been used, what human intervention has occurred, and whether the opposing party can present an effective challenge. Where there is a lack of transparency, bias, or risk of manipulation, technical sophistication does not necessarily bolster evidence; sometimes, it can weaken it.

Therefore, anyone relying on automated analyses, AI tools, or algorithmic reports must bear a greater burden of technical justification. It is not enough to simply provide the result. The system's logic, its sources, limitations, the degree of human oversight, and the safeguards applied must be explained. The authority of the tool cannot replace the proof of its reliability.

In this context, traceability becomes a central element. It must be possible to reconstruct the lifecycle of the evidence: the origin, collection, access, transfers, preservation, metadata, and controls applied. This requirement gives new importance to the chain of custody also in civil and commercial proceedings. The more digital the evidence, the more important it is to establish not only what it demonstrates, but also how it was generated, preserved, and presented to the court.

However, digital evidence is not evaluated in isolation or as a purely technical matter. Its effectiveness also depends on its coherence with the rest of the evidence, the quality of its acquisition, and its ability to withstand attacks from the opposing party. Technology does not replace the court's discretionary judgment, but introduces additional elements that must be weighed in legal terms.