Investigative Secrecy under Art. 329 c.p.p.: Limits, Duration, and Defense Strategies

1. 1.

   The General Regime and Scope of Secrecy

   Under Art. 329 c.p.p., investigative acts performed by the Public Prosecutor (Pubblico Ministero) and judicial police are covered by secrecy until the defendant can legally access them. The absolute limit is the conclusion of preliminary investigations. As confirmed by the Supreme Court (Cass. Sez. I, n. 41640/2019), secrecy encompasses not just the physical document but its informative content, including topics and involved parties. However, 'discoverable acts' (atti conoscibili), such as interrogations, inspections, or confrontations where the defense has a right to be present, are excluded from this secrecy regime.

2. 2.

   Expiration of Secrecy and the Role of Art. 415 bis

   Secrecy automatically lapses in two cases: when an act is filed for procedural needs (such as precautionary measures or evidentiary hearings) or upon service of the notice of completion of preliminary investigations under Art. 415 bis c.p.p. By 2026, digitalization via the Criminal Acts Filing Portal (PDP) has become vital. Case law from 2025 established that deposito apparente (apparent filing), where the 415 bis notice is served but digital files are not actually available to the defense, results in the nullity of the subsequent richiesta di rinvio a giudizio (request for trial), ensuring that discovery is substantive rather than just formal.

3. 3.

   Prosecutor Powers: Secretation and De-secretation

   Art. 329 c.p.p. grants the Prosecutor two discretionary powers. Paragraph 2 allows for partial 'de-secretation' via a reasoned decree if necessary for further investigation. Conversely, paragraph 3 allows for 'further secretation' of acts that would normally be discoverable, if their disclosure could hinder investigations into other parties. The Supreme Court (Judgment No. 7647/2025) clarified that if these acts are used in special proceedings like the summary trial (giudizio abbreviato), the defense may claim nullity under Art. 178 c.p.p. by demonstrating a concrete prejudice to defense rights caused by the lack of access.

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   4.

   Violations of Secrecy and Publication Bans

   Revealing secret acts constitutes offenses such as Art. 326 c.p. (breach of official secrecy) and Art. 379 bis c.p. A major update from the Nordio Reform concerns Art. 114 c.p.p., which since January 2025 prohibits the publication of precautionary orders (ordinanze cautelari) until the investigation's end or the preliminary hearing. This rule aims to safeguard the presumption of innocence by preventing the media dissemination of order excerpts that often contain preliminary guilt assessments before the defense has had a full opportunity to challenge the merits of the case.

5. 5.

   AI-Assisted Defense Strategies

   In 2026, utilizing AI models like ChatGPT, Claude, or Gemini assists defense counsel in verifying the legitimacy of secrecy decrees. AI can analyze whether the reference to 'investigative needs' is specific or a mere boilerplate clause (clausola di stile), facilitating the drafting of opposition briefs. Furthermore, by training models on the parameters of Law 241/1990 and Articles 116 and 415 bis c.p.p., lawyers can generate targeted access requests, technically distinguishing between non-secretable administrative acts and investigative acts still restricted under Art. 329 c.p.p.

6. 6.

   Deadline Monitoring and Digital Discovery

   Modern defense must strictly monitor the maximum duration of investigations to identify the exact moment legal secrecy expires. Digital tools allow for constant checking of file availability on the PDP. Should the Prosecutor unjustifiably delay discovery after the 415 bis notice, counsel must immediately challenge the irregularity. A proactive approach involves contesting not only the secrecy of acts but also the omission of favorable evidence which, while not secret, may not have been promptly made available to the defense.

References: Articolo 329 c.p.p.Articolo 415 bis c.p.p.Legge 9 agosto 2024, n. 114Articolo 114 c.p.p.Cassazione Penale, Sez. I, n. 41640/2019Cassazione Penale, n. 7647/2025

Editorial oversight: Avv. Federico Papa·ICAMUpdated 25 October 2026Content drafted with AI support and subject to editorial source checks. Despite these controls, inaccuracies may remain: reports and rectification requests are welcome. Report a correction