Question juridique clé
Whether the public-law appeal could challenge the refusal to order a psychiatric expertise under Art. 13 CP
Solution extraite
The complaint concerned federal criminal law and had to be raised by nullity appeal, so the public-law appeal was inadmissible on that point.
Motifs extraits
A failure to order an expertise prescribed by federal law is a violation of federal criminal law, not a constitutional issue; only criticism of evidence appraisal based on an existing expertise may be raised by public-law appeal.