While INTERPOL’s Red Notice attracts the most attention, the Diffuse Notice (also called an INTERPOL Diffusion) is a lesser-known but equally consequential tool used by law enforcement agencies worldwide. Understanding what a Diffuse Notice is — and crucially how it differs from a Red Notice — is essential for anyone dealing with international legal issues.
What Is an INTERPOL Diffuse Notice?
An INTERPOL Diffuse Notice (or Diffusion) is a request for international police cooperation sent directly by one country’s law enforcement to other INTERPOL member countries, without going through INTERPOL’s General Secretariat. Unlike formal notices (Red, Blue, Green, etc.), a Diffusion bypasses the central approval process.
Diffusions can request: arrest or provisional detention pending extradition; location and identification of a person; seizure of objects or evidence; or any other specific law enforcement action. For a broader overview of all INTERPOL notice types, see INTERPOL Notices explained. You can also read about the formal INTERPOL Diffusion mechanism in detail.
Diffuse Notice vs Red Notice: Key Differences
| Feature | Red Notice | Diffuse Notice (Diffusion) |
|---|---|---|
| Approval process | Vetted by INTERPOL Secretariat | Sent directly, no central vetting |
| Publication | Published in INTERPOL database; sometimes public | Sent directly to selected NCBs only |
| Legal weight | Formal INTERPOL instrument | Less formal; treated as bilateral cooperation request |
| Processing time | Weeks to months | Can be issued within hours |
| Scope | All 196 member countries | Selected countries chosen by issuing NCB |
| CCF challenge available | Yes | Yes (if data held in INTERPOL systems) |
Why Diffuse Notices Are Often More Dangerous in Practice
Although Diffuse Notices lack the formal authority of a Red Notice, they can be more dangerous in practice for several reasons:
- Speed: A Diffusion can be issued within hours of a criminal complaint, long before a formal Red Notice could be processed.
- Less oversight: Because they bypass INTERPOL’s General Secretariat review, Diffusions are more susceptible to abuse for politically motivated purposes.
- Invisibility: Unlike Red Notices, Diffusions are not published publicly. A person may not know a Diffusion exists against them until they are detained.
- Border enforcement: Many countries load Diffusion data into the same border control systems as formal notices, meaning the practical effect at checkpoints can be identical.
Who Can Issue a Diffuse Notice?
Any INTERPOL member country can issue a Diffusion through its National Central Bureau (NCB). The requesting NCB selects which other NCBs to send the Diffusion to — it does not need to go to all 196 members. This targeted nature makes Diffusions particularly useful for regional investigations. Countries that frequently use Diffusions include post-Soviet states, countries with active fugitive tracking programs, and jurisdictions with large diaspora communities abroad.
Can a Diffuse Notice Be Challenged?
Yes. If a Diffusion’s data is stored in INTERPOL’s databases, the CCF has jurisdiction to review it. The challenge process is similar to a Red Notice challenge: submit a data access request to the CCF to confirm whether Diffusion data is held; if confirmed, file a formal challenge on applicable grounds (political motivation, inaccurate data, human rights concerns); request provisional measures if there is an urgent risk of arrest.
However, because Diffusions may be sent directly to NCBs without being stored centrally, some Diffusions may fall outside CCF jurisdiction. In such cases, legal action must be pursued at the national level in each recipient country. For a detailed guide on challenging INTERPOL notices, see our guide to INTERPOL Red Notice removal and our overview of fighting an INTERPOL notice.
INTERPOL Diffusion and Human Rights Concerns
The reduced oversight of Diffuse Notices has made them a tool of choice for governments pursuing political opponents, journalists, and activists abroad. Cases documented by Fair Trials International, Amnesty International, and the human rights community include situations where individuals were detained at borders based on Diffusions issued by authoritarian states, without any prior knowledge or opportunity to challenge the notice. INTERPOL has taken steps to address this — including enhanced compliance checks — but the system remains less transparent than the formal notice system.
What To Do If You Suspect a Diffuse Notice Against You
If you believe a Diffuse Notice may exist against you — perhaps because you have encountered unexpected problems at border crossings — take these steps immediately:
- Submit a data access request to the CCF to determine what INTERPOL data exists about you
- Check INTERPOL’s public Red Notice database as a starting point (note: Diffusions are not listed publicly)
- Consult an international lawyer experienced in INTERPOL proceedings before travelling internationally
- Consider whether you qualify for refugee status or other forms of international protection
Contact our team for a confidential assessment. We advise clients on both formal INTERPOL notice challenges and Diffusion-specific proceedings.