Question juridique clé
Whether the state could rely on good faith after a procedural practice change requiring personal appearance instead of counsel representation at the opposition hearing.
Solution extraite
Yes. Because opposition restores the case to its initial state, the state could still raise immunity and could reasonably expect counsel representation to be accepted; the sudden practice change without prior warning could not be enforced against it.
Motifs extraits
The court held that a new procedural jurisprudence generally applies immediately, but a change affecting procedural rights must be preceded by warning when reliance interests are protected by art. 9 Cst. The state was led to believe that counsel appearance sufficed; no effective warning was shown.