Why do we not declare people impure because of biblical tzaraat today, even though the laws of tzaraat apply in every era?

This source-based Torah study examines the question: Why do we not declare people impure because of biblical tzaraat today, even though the laws of tzaraat apply in every era? The canonical Hebrew article develops the issue through the weekly Torah portion and the sources cited there. This localized discovery layer preserves the question and the source identity; it does not add any new halakhic, medical, legal, scientific, historical, theological, or empirical ruling or claim beyond the canonical Hebrew source.