Supreme Court reversed social insurance court for failing to order evidence despite civil procedure's adversarial principle.

The Supreme Court of Poland quashed the appellate court's dismissal of Ryszard B.'s claim for a disability pension due to a work accident. The applicant argued that his heart attack during a driving lesson was a work accident, while the social insurance office denied it due to lack of an external cause. The court ruled that the appellate court erred by not ordering expert medical evidence despite the statutory duty to clarify the case's essence, overriding the strict adversarial principle.