Question juridique clé
Whether the nullity appeal against the cantonal interlocutory decision was admissible
Solution extraite
Yes. The decision finally determined a point of federal law, namely the applicability of Art. 10c LAVI to the ordered expertise.
Motifs extraits
An interlocutory decision is open to nullity appeal when the cantonal authority has definitively ruled on a federal-law issue; the appellant, as an alleged victim, could invoke LAVI procedural rights.