Kernrechtsfrage
Whether the refusal to renew the residence permit was lawful despite marriage to a Swiss citizen.
Extrahierter Entscheid
The claim to renewal lapsed because an expulsion ground existed and the proportionality assessment favored refusal.
Extrahierte Begründung
The conviction for serious cocaine trafficking established a weighty public interest in exclusion; the marriage no longer entailed a protected family life, the long stay was weakened by prior separations and imprisonment, and the appellant remained insufficiently rooted in Switzerland.