Question juridique clé
Whether the US request satisfied the treaty requirements for mutual legal assistance despite incomplete factual details and later supplementation.
Solution extraite
The request, taken together with its supplementation and plea agreement, provided enough detail to assess the existence of an assistable offense and any refusal grounds.
Motifs extraits
The requesting state need not present a fully complete or contradiction-free account; it is enough that the Swiss authorities can assess dual criminality, refusal grounds, and the scope of assistance. No obvious errors, gaps, or contradictions undermined the factual basis.