Law and methodology
An IT expert opinion: scope, method and limits of inference
Framing expert questions and assessing transparency under Articles 193, 194, 200 and 201 of the Polish Code of Criminal Procedure.
Start with a question
Article 193 links expert evidence to the need for specialist knowledge. Article 194 sets out the content of the decision commissioning an opinion, including its subject, scope and questions. “Did this person commit an offence?” is not a substitute for a technical question such as “Which records indicate that a message was sent, and what limits identification of its author?” The expert addresses the material within their expertise.
Connect observations to conclusions
Article 200 requires an account of the examination, observations and conclusions based on them. A digital examination should make the material identifiers, acquisition method, tool versions and reasoning traceable. A hash helps check whether a copy remains unchanged; it does not by itself prove the truth of its contents or the identity of a user.
Address an unclear opinion
Article 201 allows the same experts to be called again or other experts appointed where an opinion is incomplete, unclear or contains specified contradictions. Identify the specific gap: an unexplained time zone, missing source or unresolved discrepancy. Methodological comment: distinguish observations, interpretations and limitations, including when the material cannot support a definite answer.
Legal basis
This overview refers to the consolidated Polish Code of Criminal Procedure, Journal of Laws 2026, item 490. Applying a provision to a particular case requires checking the applicable law and transitional rules.
Sources and further reading
Educational material about Polish proceedings and digital forensics. Individual cases require examination of their records. Translations do not change the jurisdiction of the legislation discussed.
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