Question juridique clé
Whether the acquitted defendants could be charged with criminal costs under cantonal law despite acquittal.
Solution extraite
No costs could be imposed because no clearly established civil-law fault and no causal link to the opening or prolongation of the prosecution were shown.
Motifs extraits
An acquitted person may bear costs only if equitable and if he or she clearly violated a legal duty in a way that causally triggered or complicated the proceedings; the cantonal findings did not establish such fault, and the alleged causal link was based on the wrong expert report.