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The Legal Safeguard Mc Kinnon's Case Lacked

Extradition judges initially lacked a strong statutory power to keep McKinnon in Britain when a domestic prosecution appeared more just.

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On this page

  • What a forum bar allows an extradition judge to decide
  • Why venue decisions remained with prosecutors
  • How the controversy helped drive later reform

Introduction

One of the most influential legal issues in Gary McKinnon’s extradition case was not whether he had accessed United States military computers, but whether a British court had any meaningful power to decide that he should instead be prosecuted in the United Kingdom. At the time, that safeguard—known as a forum bar—was effectively unavailable. As a result, the central decision about the proper venue for prosecution rested largely with prosecutors rather than judges, leaving the courts with only limited scope to examine whether justice would be better served by a domestic trial. The controversy surrounding that gap became one of the strongest arguments for reforming the UK’s extradition system and ultimately contributed to the introduction of a new statutory forum bar after McKinnon’s case.[GOV.UK]GOV.UKGary Mc Kinnon extradition case: Home Secretary's statementGary McKinnon extradition case: Home Secretary's statement - GOV.UKOctober 16, 2012…Published: October 16, 2012

Forum Bar illustration 1

What a forum bar allows an extradition judge to decide

A forum bar is a statutory defence in extradition proceedings that allows a judge to refuse extradition where a substantial part of the alleged criminal conduct occurred in the United Kingdom and where, after considering specified “interests of justice” factors, a domestic prosecution would be the fairer outcome.

The principle recognises that many modern offences—particularly computer crime—cross national borders. Someone may act entirely from Britain while causing effects overseas. In such situations, more than one country may legitimately claim jurisdiction. A forum bar does not prevent extradition simply because some conduct occurred in Britain. Instead, it permits a court to weigh factors such as:

  • where most of the alleged conduct occurred;
  • where the principal harm was suffered;
  • where the available evidence and witnesses are located;
  • the interests of victims;
  • the availability of prosecution in the UK; and
  • the overall interests of justice.

Under today’s Extradition Act framework, judges can examine those questions directly. During McKinnon’s litigation, however, they could not exercise that balancing role because no operative statutory forum bar existed.[Crown Prosecution Service]cps.gov.ukCrown Prosecution Service ExtraditionCrown Prosecution ServiceExtradition - From the UK | The Crown Prosecution Service…

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Why venue decisions remained with prosecutors

The absence of a functioning forum bar meant that British courts could not independently determine whether the case belonged in the United Kingdom despite the fact that McKinnon had carried out all of the alleged computer access from his home in London.

Instead, the practical decision fell to prosecutorial authorities. The Crown Prosecution Service (CPS) considered whether to bring domestic charges and ultimately decided not to prosecute, allowing the American extradition request to proceed. That prosecutorial judgment was difficult to challenge because it was not a judicial determination of forum but an exercise of prosecutorial discretion.

This distinction became a major point of criticism. Opponents argued that the question of where someone should stand trial involved competing public interests and individual rights that ought to be decided openly by a court rather than indirectly through charging decisions. Judges themselves noted during related proceedings that, without a judicial forum mechanism, defendants were effectively left challenging prosecutorial decisions through judicial review rather than asking an extradition judge to decide the proper venue directly.[UK Parliament]publications.parliament.ukUK Parliament MondayVolume 537 No. 235 HOUSE OFDecember 6, 2011…Published: December 6, 2011

Forum Bar illustration 2

Why the Missing Forum Bar Mattered in McKinnon’s Case

McKinnon’s supporters argued that several features of the case made Britain an appropriate venue for prosecution:

  • he was a British citizen living in England;
  • the alleged unauthorised access was carried out entirely from British territory;
  • British computer misuse offences potentially covered the same conduct; and
  • a domestic prosecution could have achieved accountability without requiring extradition.[cps.gov.uk]cps.gov.ukCrown Prosecution Service ExtraditionCrown Prosecution ServiceExtradition - From the UK | The Crown Prosecution Service…

The United States, however, maintained an equally strong jurisdictional claim because the targeted military and NASA computer systems were located in America and the alleged financial losses and operational disruption were said to have occurred there.

Without a forum bar, the courts could not conduct a structured balancing exercise between those competing claims. The litigation therefore focused largely on the legality of extradition itself and, eventually, on McKinnon’s medical condition and human rights rather than on whether Britain was the more appropriate place for trial. That procedural limitation became one of the defining criticisms of the case.[GOV.UK]GOV.UKGary Mc Kinnon extradition case: Home Secretary's statementGary McKinnon extradition case: Home Secretary's statement - GOV.UKOctober 16, 2012…Published: October 16, 2012

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How the Controversy Helped Drive Reform

Public concern over McKinnon’s case became closely associated with broader criticism of the UK’s extradition arrangements, particularly in cases involving concurrent jurisdiction between Britain and the United States.

When announcing the decision in October 2012 to halt McKinnon’s extradition on human rights grounds, Home Secretary Theresa May simultaneously addressed the wider policy issues exposed by the case. She concluded that extradition decisions should not only be fair but should also be seen to be fair, and announced the government’s intention to introduce a new forum bar that would allow British courts to refuse extradition where prosecution in the UK better served the interests of justice. She also announced updated prosecutorial guidance and closer coordination between British and American authorities in cases of concurrent jurisdiction.[GOV.UK]GOV.UKGary Mc Kinnon extradition case: Home Secretary's statementGary McKinnon extradition case: Home Secretary's statement - GOV.UKOctober 16, 2012…Published: October 16, 2012

Parliament subsequently enacted the new forum bar provisions through the Crime and Courts Act 2013. The legislation inserted new sections into the Extradition Act 2003, giving judges an explicit statutory role in deciding whether extradition should be refused because a UK prosecution would better satisfy the interests of justice. The reform was designed to address precisely the type of jurisdictional dispute that had become prominent during McKinnon’s long legal battle.[Crown Prosecution Service]cps.gov.ukCrown Prosecution Service ExtraditionCrown Prosecution ServiceExtradition - From the UK | The Crown Prosecution Service…

Forum Bar illustration 3

A Lasting Change Beyond One Case

The significance of the missing forum bar lies less in whether it would certainly have prevented McKinnon’s extradition than in the fact that the courts never had the opportunity to answer that question using a dedicated statutory test. The dispute highlighted a constitutional gap: prosecutors decided whether to pursue a domestic case, while judges lacked authority to determine independently whether Britain was the more appropriate forum for trial.

Although McKinnon’s extradition was ultimately stopped because of the assessed risk to his mental health rather than because of forum, his case became the catalyst for giving future extradition judges a clearer role in resolving competing claims of jurisdiction. Today, forum considerations form a recognised part of extradition proceedings, reflecting one of the most enduring legal legacies of the McKinnon controversy.[gov.uk]GOV.UKGary Mc Kinnon extradition case: Home Secretary's statementGary McKinnon extradition case: Home Secretary's statement - GOV.UKOctober 16, 2012…Published: October 16, 2012

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Endnotes

1. Source: GOV.UK
Title: Gary Mc Kinnon extradition case: Home Secretary’s statement
Link:https://www.gov.uk/government/speeches/gary-mckinnon-extradition-case-home-secretarys-statement

Source snippet

Gary McKinnon extradition case: Home Secretary's statement - GOV.UKOctober 16, 2012...

Published: October 16, 2012

2. Source: cps.gov.uk
Title: Crown Prosecution Service Extradition
Link:https://www.cps.gov.uk/prosecution-guidance/extradition-uk

Source snippet

Crown Prosecution ServiceExtradition - From the UK | The Crown Prosecution Service...

3. Source: cps.gov.uk
Title: Crown Prosecution Service Jurisdiction | The Crown Prosecution Service
Link:https://www.cps.gov.uk/prosecution-guidance/jurisdiction

Source snippet

Jurisdiction | The Crown Prosecution ServiceJune 2, 2025 — JURISDICTION Updated: 5 October 2022, 2 June 2025 Prosecution Guidance * Intro...

Published: June 2, 2025

4. Source: publications.parliament.uk
Title: UK Parliament Monday
Link:https://publications.parliament.uk/pa/cm201011/cmhansrd/chan235.pdf

Source snippet

Volume 537 No. 235 HOUSE OFDecember 6, 2011...

Published: December 6, 2011

5. Source: hansard.parliament.uk
Title: Hansard Extradition
Link:https://hansard.parliament.uk/Commons/2012-10-16/debates/12101642000005/Extradition

Source snippet

Extradition - Hansard - UK Parliament...

6. Source: hansard.parliament.uk
Title: Hansard Crime and Courts Bill [HL]
Link:https://hansard.parliament.uk/lords/2013-03-25/debates/13032511000850/CrimeAndCourtsBill%28HL%29

Source snippet

Crime and Courts Bill [HL] - Hansard - UK Parliament...

7. Source: GOV.UK
Title: crime and courts bill receives royal assent
Link:https://www.gov.uk/government/news/crime-and-courts-bill-receives-royal-assent

Source snippet

and Courts Bill receives Royal Assent - GOV.UKApril 25, 2013 — News story CRIME AND COURTS BILL RECEIVES ROYAL ASSENT New legislation com...

Published: April 25, 2013

8. Source: hansard.parliament.uk
Title: uk Lords Chamber
Link:https://hansard.parliament.uk/html/Lords/2013-03-25/LordsChamber

9. Source: commonslibrary.parliament.uk
Title: uk Crime and Courts Bill [HL]: Committee Stage Report
Link:https://commonslibrary.parliament.uk/research-briefings/rp13-18/

10. Source: publications.parliament.uk
Link:https://publications.parliament.uk/pa/cm201213/cmpublic/crimeandcourts/130212/am/130212s01.htm

11. Source: hansard.parliament.uk
Title: uk Extradition
Link:https://hansard.parliament.uk/lords/2012-10-16/debates/12101643000907/Extradition

12. Source: GOV.UK
Title: crime and courts bill
Link:https://www.gov.uk/government/publications/crime-and-courts-bill

13. Source: publications.parliament.uk
Title: uk House of Commons
Link:https://publications.parliament.uk/pa/cm201012/cmselect/cmhaff/644/120228.htm

14. Source: parliament.uk
Title: Extradition Review
Link:https://www.parliament.uk/external/committees/committee-news-pre-oct-2020/2011/december/111216-extradition-review/

15. Source: publications.parliament.uk
Title: uk House of Commons
Link:https://publications.parliament.uk/pa/cm201012/cmselect/cmhaff/644/644we05.htm

16. Source: GOV.UK
Title: www.gov.uk Latest on Gary [Mc Kinnon case]({{ ‘mc-kinnon-case/’ | relative_url }})
Link:https://www.gov.uk/government/news/latest-on-gary-mckinnon-case

17. Source: committees.parliament.uk
Link:https://committees.parliament.uk/writtenevidence/52334/html/

18. Source: publications.parliament.uk
Title: uk House of Lords
Link:https://publications.parliament.uk/pa/ld201415/ldselect/ldextradition/126/12607.htm

19. Source: eastdulwichforum.co.uk
Title: Gary Mc Kinnon
Link:https://www.eastdulwichforum.co.uk/topic/7311-gary-mckinnon-martyr-or-muppet/

Additional References

20. Source: youtube.com
Title: UK blocks hacker extradition to U.S
Link:https://www.youtube.com/watch?v=xudYoyi_JSY

Source snippet

The Man Who Hacked the U.S. Government This video details Gary McKinnon's legal battle against US extradition and the policy debates over...

21. Source: crimeline.co.uk
Link:https://crimeline.co.uk/knowledge-base/case-comment-good-news-for-the-future-of-the-forum-bar/

22. Source: theguardian.com
Link:https://www.theguardian.com/world/2011/oct/18/gary-mckinnon-extradition

23. Source: theguardian.com
Link:https://www.theguardian.com/world/blog/2012/oct/16/gary-mckinnon-extradition-decision-live

24. Source: youtube.com
Title: The Man Who Hacked the U.S. Government
Link:https://www.youtube.com/watch?v=ND0zQX1rGdg

Source snippet

Hacking for UFOs and fighting for his life. Who is Gary McKinnon?...

25. Source: youtube.com
Title: Hacking for UFOs and fighting for his life. Who is Gary Mc Kinnon?
Link:https://www.youtube.com/watch?v=OImdnvQx7sQ

Source snippet

Britain stops hacker extradition to US...

26. Source: lawgazette.co.uk
Title: M Ps consider extradition forum bar | News | Law Gazette
Link:https://www.lawgazette.co.uk/news/mps-consider-extradition-forum-bar/69013.article

27. Source: theguardian.com
Link:https://www.theguardian.com/politics/2013/feb/06/home-secretary-overhauls-extradition-laws

28. Source: youtube.com
Title: Britain stops hacker extradition to US
Link:https://www.youtube.com/watch?v=TpwHje20un8

Source snippet

Gary McKinnon wins extradition battle...

29. Source: youtube.com
Title: Gary Mc Kinnon wins extradition battle
Link:https://www.youtube.com/watch?v=y4lecD44F5E

Source snippet

UK blocks hacker extradition to U.S...