Question juridique clé
Whether the cantonal court acted arbitrarily by holding the nullity appeal inadmissible under Art. 348 CPP/JU despite a later supplementary filing.
Solution extraite
No. A timely filing that contains no conclusions or reasons is inadmissible; the supplementary filing cannot cure that defect if the initial appeal did not at least briefly identify the challenged points and grounds.
Motifs extraits
The wording of Art. 348 CPP/JU requires the appeal to state the challenged parts of the decision, the conclusions, and the reasons. Allowing conclusions and grounds to be submitted for the first time only after service of the written reasons would deprive paras. 1 and 2 of effect.