Interpol Diffusion Notice: Legal Challenge and Defence

An Interpol Diffusion is a request sent directly from one National Central Bureau to selected other NCBs — or to all 196 member country NCBs simultaneously — asking for cooperation in locating, arresting, or gathering information about a specific individual. The defining feature of a Diffusion is that it bypasses the General Secretariat’s pre-screening process that applies to formal Red Notices. A member country’s NCB can issue a Diffusion without waiting for central approval, which makes it significantly faster to circulate than a Red Notice.

Despite the procedural difference, Diffusions carry the same substantive legal weight as Red Notices in the countries that receive them. Law enforcement in recipient countries sees a Diffusion through the I-24/7 secure communications system in the same way as a formal Red Notice — as a request for cooperation requiring a response. In practice, a Diffusion requesting provisional arrest has identical enforcement consequences to a Red Notice in jurisdictions that act on it.

The absence of pre-screening makes Diffusions attractive to requesting states for two reasons. First, speed: a Diffusion can be circulated within hours of a decision to pursue an individual internationally, while a Red Notice application requires documentation review by the General Secretariat. Second, selectivity: a Diffusion can be sent to specific NCBs rather than all 196 member states, allowing the requesting state to target particular jurisdictions without creating a globally visible record.

The practical consequence is that Diffusions are sometimes used to pursue enforcement goals that would not pass INTERPOL’s formal compliance review. Academic research and CCF decisions have documented cases where Diffusions were issued for politically motivated prosecutions, commercial disputes, and cases where dual criminality would fail — precisely because the pre-screening filter that catches such abuses in the Red Notice process does not apply to Diffusions. This is a known systemic issue in INTERPOL’s architecture.

A Diffusion requesting provisional arrest creates immediate detention risk in every jurisdiction that received it. Unlike a Red Notice, which appears in INTERPOL’s public-facing wanted persons database, Diffusions are not publicly visible — they circulate only through the law enforcement I-24/7 system. This means an individual subject to a Diffusion may have no way of knowing it exists until they encounter enforcement action at a border crossing or during a routine police check in a recipient country.

The geographic reach of a Diffusion depends on whether it was sent to specific NCBs or globally. A global Diffusion creates equivalent travel risk to a Red Notice across all member states. A targeted Diffusion sent to, say, European NCBs creates concentrated risk in that region while leaving other regions unaffected. This geographic targeting is relevant both to travel risk assessment and to legal strategy: challenging a Diffusion through the CCF removes it from all databases simultaneously, regardless of how many NCBs received it.

The Commission for the Control of INTERPOL’s Files has full jurisdiction over Diffusions. The same rules that govern Red Notices — INTERPOL’s Constitution, the Rules on the Processing of Data, and the fundamental prohibition on politically motivated notices in Article 3 — apply equally to Diffusions. The CCF applies identical substantive standards regardless of whether the notice was issued as a formal Red Notice or a Diffusion.

The CCF process for a Diffusion follows the same steps as a Red Notice challenge. The first step is a data access request — submitted in writing to the CCF — to establish whether a Diffusion exists, which NCBs received it, and what it contains. This is the definitive way to confirm a Diffusion exists, since Diffusions do not appear in any public database. Following the access request, a substantive application for deletion is filed setting out the legal grounds: political motivation, accuracy failures, dual criminality failures, human rights concerns, or procedural invalidity.

The CCF reviews the application, seeks a response from the requesting NCB, and issues a decision. A deletion order is binding on INTERPOL’s General Secretariat, which must comply and notify all recipient NCBs. The requesting state cannot re-issue the Diffusion on the same factual basis following a successful challenge.

Where a Diffusion creates imminent arrest risk — for example, where an individual needs to travel urgently and a Diffusion is known to be active in the destination country’s NCB — the CCF can consider requests for interim measures suspending the Diffusion’s effect pending the full review. Interim measures are not automatically granted; they require a showing of urgency and a preliminary assessment that the challenge has merit. Processing times for urgent requests are faster than standard CCF proceedings.

Our lawyers file CCF access requests and deletion applications on behalf of clients facing Diffusions. The process requires specialist knowledge of INTERPOL’s rules, the CCF’s procedural requirements, and the substantive legal standards applied in these proceedings. Contact us for a confidential assessment of your situation. See also our detailed guidance on CCF challenges and Red Notice removal.

A CCF challenge addresses the international enforcement mechanism — the Diffusion itself — but does not affect the underlying domestic criminal proceedings in the requesting state. Deletion of the Diffusion removes the global arrest risk; it does not prevent the requesting state from pursuing extradition through bilateral channels or from continuing domestic prosecution in absentia. The Diffusion challenge is therefore one component of a broader legal strategy that must also address the domestic proceedings, any extradition risk, and asset protection where relevant.

In cases where the Diffusion arises from a commercial dispute or civil matter that has been incorrectly criminalised, parallel legal action in the requesting jurisdiction — demonstrating the civil nature of the underlying dispute — strengthens the CCF challenge and may independently resolve the matter. Coordination between the CCF process and domestic legal representation is essential for the most effective outcomes.