Key legal question
Whether the cantonal authority arbitrarily assessed the evidence and upheld dismissal without sufficient suspicion against Y.
Extracted holding
The evidence did not make Y.'s participation sufficiently probable; the cantonal assessment was not manifestly untenable.
Extracted reasoning
The court found that the cited indications were either equivocal, explained by the context, or not supported by proof; expert and witness evidence did not exclude alternative hypotheses.