How INTERPOL diffusions affect international travel

If you are planning on travelling internationally, whether by plane, ship, or train, and suspect that an INTERPOL diffusion may exist against your name, you should carefully reconsider your plans. A diffusion can have very real consequences for your freedom of movement, including detention, refusal of entry, or even arrest.

While diffusions are less formal than Red Notices, in practice they can sometimes produce similar effects at borders and should be taken seriously.

What is an INTERPOL diffusion?

An INTERPOL diffusion is an alert issued by a country’s National Central Bureau (NCB) and circulated through INTERPOL’s secure communication system. Unlike a Red Notice, which undergoes review by INTERPOL’s General Secretariat before being published, diffusions are sent directly to selected countries or the entire network.

This means that:

• They are issued faster but are less thoroughly checked in advance.
• They should have a valid legal basis (e.g. an arrest warrant or conviction), but the verification standards are lower than those for Red Notices.
• INTERPOL’s General Secretariat can later review and delete them if they breach INTERPOL’s rules, but this review happens after the diffusion is already active.

Importantly, diffusions are not published on INTERPOL’s public website.  This means that even if you search for your name and find nothing, a diffusion could still exist against you, leaving you unaware until you are stopped by border authorities.

How can a diffusion affect international travel?

When you cross a border, immigration or police systems may flag the diffusion linked to your passport. What happens next depends on the country. Measures can include:

• Arrest or detention: Some jurisdictions treat diffusions almost like Red Notices and may arrest you immediately. If the requesting country seeks extradition, formal legal proceedings could follow, often involving lengthy court battles.
• Questioning or secondary checks: In other countries, authorities may only detain you briefly for questioning or refuse you entry.
• Visa or entry denials: Even without arrest, the diffusion can make obtaining visas or entering a country very difficult.

Since each country acts at its own discretion, the consequences are unpredictable; some may strictly enforce the diffusion, while others may ignore it or require additional verification.

Why do diffusions make travel risky?

The major problem with diffusions is their uncertain and uneven impact:

• You usually do not know where the diffusion has been circulated.
• Different countries apply different standards when it comes to acting upon them.
• Even if extradition is unlikely, you may still face delays, questioning, or being turned back at the border.

In short, the hidden nature of diffusions and the wide discretion of national authorities make international travel for affected individuals highly unpredictable and stressful.

While less formal than Red Notices, INTERPOL diffusions can still disrupt travel and lead to detention or extradition attempts. Because they are not public, you may not realise one exists until it affects you directly. Anyone who suspects they may be the subject of a diffusion should seek legal advice before travelling internationally.

How can Gherson help?

Those who believe that they may be subject to INTERPOL measures, including a Red (or Blue) Notice or diffusion, should take heed.

Gherson Solicitors continue to receive requests for expert advice and assistance from those who suspect they may have outstanding financial issues which may engage INTERPOL. The advice we could provide in these circumstances includes:

1. How best to approach a possible INTERPOL notice
2. How to prepare for potential criminal proceedings and/or an extradition request
3. What can be done to prepare for a situation where a civil matter or commercial dispute could be used to initiate bogus criminal proceedings?
4. Exploring the possibility of instigating civil litigation proceedings to recover any misappropriated assets.

Gherson Solicitors have previously written a series of blogs designed to assist those who have a reason to believe they may be subject to INTERPOL measures (including Red or Blue Notices):

• What is INTERPOL’s Silver Notice?
• INTERPOL UPDATE – India charges 8 people in first Interpol Silver Notice Case
• What is an INTERPOL Yellow Notice?
• What is an INTERPOL-United Nations Security Council Special Notice?
• What is an INTERPOL Purple Notice?
• What is an INTERPOL Green Notice and can it be challenged?
• What is an INTERPOL Orange Notice and can it be challenged?
• What is the purpose of an INTERPOL Blue Notice, and can it be challenged?
• What is an INTERPOL Blue Notice?
• INTERPOL and Red Notice Challenges
• How to Remove an INTERPOL Red Notice
• INTERPOL Red Notices and Extradition
• How do I know if I am subject to an INTERPOL Red Notice?

Gherson has over 30 years of experience in assisting with all aspects of INTERPOL Red Notice challenges and extradition. If you would like to speak to us in respect of any of the issues raised in this article or about your specific circumstances,  do not hesitate to contact us for advice, send us an e-mail, or alternatively, follow us on X, Facebook, or LinkedIn to stay-up-to-date.

The information in this blog is for general information purposes only and does not purport to be comprehensive or to provide legal advice. Whilst every effort is made to ensure the information and law is current as of the date of publication it should be stressed that, due to the passage of time, this does not necessarily reflect the present legal position. Gherson accepts no responsibility for loss which may arise from accessing or reliance on information contained in this blog. For formal advice on the current law please do not hesitate to contact Gherson. Legal advice is only provided pursuant to a written agreement, identified as such, and signed by the client and by or on behalf of Gherson.

©Gherson 2025