Supreme Court, A. v Belgium, Nr. P.25.1072.N, 29 July 2025
A former diplomat challenged the lawfulness of a house search on 17 June 2025 and her subsequent detention. She argued that while her diplomatic functions had ended on 27 November 2024, she continued to enjoy diplomatic immunity under the 1961 Vienna Convention on Diplomatic Relations (VCDR) as her Belgian residence permit remained valid and no explicit notification had been given regarding the expiry of the “reasonable period” to leave Belgium, as referred to in Article 39 (2) VCDR. She further contended that the search was invalid because her residence formed part of the inviolable premises of the mission under Article 22 VCDR.
The Court of Cassation found the latter plea to be inadmissible as it concerned a factual assessment for which it was not competent.
As to the former plea, the Court of Cassation held that the determination of the “reasonable period” under Article 39(2) falls within the autonomous assessment of the receiving State’s judiciary and does not require formal notification to the diplomat, nor a prior decision by the sending State. The existence of a residence permit does not bind the judge when assessing the expiry of immunity. Once the reasonable period has lapsed, immunity – including inviolability and protection from arrest – ceases to apply. As a result, the Court confirmed that the claimant no longer benefited from diplomatic immunity at the time of the search and rejected the appeal.
