Why Uncertainty Cannot Be Governed After the Fact

This paper presents a negative result. In systems that operate under uncertainty, governance applied after execution cannot function as governance. Once a system has crossed a decision boundary and committed to action, no subsequent oversight, review, or accountability mechanism can constrain that action. This is not a failure of institutional will, ethical seriousness, or regulatory sophistication. It is a consequence of timing, causality, and information loss. By formalising uncertainty as an invariant feature of complex systems and execution as an irreversible commitment, the paper shows that governance applied downstream of execution is structurally non-binding. The result is an impossibility claim: uncertainty cannot be governed after it has already been acted upon.