A more thorough explanation:

Definition: Casus improvisus (kay-suh-s im-pro-vi-zuhs) is a Latin term that refers to an unforeseen case or situation that was not provided for.

For example, if a law was passed to address a specific problem and only applies to certain circumstances, but a situation arises that is not covered by the law, that situation is considered a casus improvisus. In such cases, the law cannot be applied to the new situation because it was not included in the original law.

However, if a law is meant to remedy a problem, it can be interpreted more broadly to include similar situations that were not explicitly mentioned in the law.

Overall, casus improvisus refers to a situation that was not anticipated or planned for, and therefore cannot be addressed by existing laws or regulations.