Every policy decision (at a specific time) that is made using a digital twin must be reproducible at a later time. So the state that the Digital Twin has at a certain moment must be recallable, including the value of the indicators on which the decision was made. The reproducibility of the circumstances in which a policy decision is made, by means of a Digital Twin, is very important: In a constitutional state, decisions are made based on a legal framework and linked indicators, and The Digital Twin is truly seen as a policy instrument and that it can be trusted and helps in efficiency.