Kernrechtsfrage
Whether the disability pension was validly revised and revoked retroactively as of 1 May 2008.
Extrahierter Entscheid
The prior full pension was rightfully revoked because a material improvement in health and work capacity had been established.
Extrahierte Begründung
The court accepted the expert report and the corroborating surveillance and RAD assessments; the objections against evidentiary value, alleged contradictions, and unlawfulness of surveillance were unfounded.