(CN) - Europe's post-Brexit extradition pact with the United Kingdom came under fresh scrutiny Thursday, as an EU legal adviser said its "rule of speciality" must serve as a firm legal shield - meaning anyone handed over can only be tried for the specific offenses listed in their arrest warrant and nothing more.
In a detailed opinion for the Court of Justice of the European Union, Advocate General Laila Medina said the safeguard is more than a line of legal text - it is a core promise woven into the Trade and Cooperation Agreement to keep cross-Channel justice fair and predictable.
That guarantee, she said, gives anyone surrendered under the agreement the power to push back if prosecutors try to widen the case after their transfer.
As Medina put it, "the executing judicial authority must have the jurisdiction and duty to ensure its observance by refusing surrender or by requiring binding assurances where a breach of that guarantee is likely."
It all began with a fraud case in southern England, where three British nationals - directors and co-owners of a home repair company - were accused of scamming elderly homeowners through false claims and needless, overpriced renovation work.
After investigators said they uncovered the scheme, a British court froze their assets in March 2021 to secure compensation for victims if the trio was convicted. But when they ignored the order and failed to comply, a British trial court in Reading found them in contempt and sentenced each to six months in prison.
Prosecutors in Portsmouth later issued arrest warrants to bring them back for trial, but when the case reached Irish judges, the three resisted, arguing they had already been punished for contempt and warning that sending them back could expose them to new penalties for conduct not covered by the warrant.
Under British law, that contempt counted as a civil matter rather than a criminal one, so it never made it into the arrest warrants sent to Ireland. Unsure whether that distinction mattered, Ireland's Supreme Court turned to the EU judges in Luxembourg for guidance, asking if contempt of court should qualify as an "offense" under the agreement and whether extradition must be blocked if there's a real chance the suspects could be punished for it later.
Medina said what matters isn't how a country labels an offense but what it actually is. She said the term "offense" under the agreement should have its own EU meaning, independent of how the U.K. classifies it, and that judges should look at whether the act and its penalty are criminal in nature - taking cues from an earlier EU case that drew on human rights court standards like the act's purpose, character and severity.
She also reminded the court that the post-Brexit Trade and Cooperation Agreement still sits within EU law and must align with the EU Charter of Fundamental Rights, meaning extraditions can't undermine rights to liberty, a fair trial or legal certainty. The system, she said, is built on cooperation with safeguards, not blind trust between governments.
Jed Odermatt, a reader in international and EU law at City St George's, University of London, said the opinion underlines how the Trade and Cooperation Agreement must still be read through both EU and international-law principles. He added the approach "puts strong emphasis on ensuring that individual rights are effective and enforceable," a point that could shape future EU-U.K. cases touching on fundamental rights.
In practical terms, Medina said national judges need to dig deeper and decide for themselves whether contempt of court counts as an offense under the agreement.
If they find the act or punishment is criminal in nature, they must then use solid, verifiable evidence to assess whether extraditing the person could lead to further prosecution or detention beyond the charges listed in the warrant.
If there's any real risk of that happening, she said, the Irish court should demand written assurances from the U.K. that no extra punishment will follow. And if those assurances don't come or fail to convince, extradition must be refused.
Medina wrapped up her opinion by saying that when the Trade and Cooperation Agreement is read alongside the EU Charter, it clearly blocks extradition in cases where conduct labeled "civil" in one country is effectively criminal in another, unless proper guarantees are in place to protect the person's rights.
Brexit may have redrawn the map of Europe's justice system, but it didn't end cooperation entirely. When the U.K. formally left the European Union in 2020, the European Arrest Warrant - the fast-track tool used for nearly four decades - fell away, leaving judges with a more fragmented system where safeguards matter as much as speed.
It was replaced by the Trade and Cooperation Agreement, or TCA, now facing its first real tests. In her opinion, Medina illustrated how that new arrangement works on the ground. Instead of the automatic trust that once defined EU cooperation, the TCA relies on checks, guarantees and case-by-case scrutiny.
Legal scholars said the case could shape how Europe's new extradition system works - and how far it stretches across the Channel after Brexit.
Samantha Velluti, an associate professor of law at the University of Sussex, said it is a major test of how EU law defines what qualifies as an "offense" under the post-Brexit framework. "Because the TCA forms part of EU law, the court is likely to give 'offense' an autonomous meaning, assessed against the act's nature, purpose and severity rather than national labels," she said.
She added that the case also exposes the political strain between the EU's rights-based legal order and the U.K.'s growing pushback against European human-rights oversight. "The court will be influenced by Strasbourg case law on fair-trial rights, and that could cause friction with parts of the U.K. judiciary that have become increasingly critical of the European Convention on Human Rights," Velluti said.
Steve Peers, a professor of EU and human rights law at Royal Holloway, University of London, agreed the opinion could have far-reaching consequences for cross-border justice. "It could make it effectively impossible for the U.K. to punish people for contempt of court where it is seeking their extradition from the EU," he said.
He also noted that while fugitives in EU countries might still be able to rely on individual safeguards built into the Brexit deal, "no such protection exists in the reverse direction." Peers added that the advocate general's view "emphasizes that the extradition arrangements under the Brexit deal are different from when the U.K. was a member state applying the European Arrest Warrant."
The Irish Department of Justice and the U.K. Ministry of Justice did not respond to requests for comment.
The Court of Justice is expected to rule in the coming months. Though not binding, the advocate general's opinion could shape the final verdict and define how far post-Brexit justice can go when rights are on the line.
Courthouse News reporter Eunseo Hong is based in the Netherlands.
Source: Courthouse News Service
