What legal principle applies when there is no constitutional law or statute regarding a case?

The correct answer is common law. Common law is a legal system that is developed through court decisions and judicial interpretations rather than through legislative statutes or executive branch action. When there is no specific constitutional law or statute that addresses a particular legal issue, courts often look to existing judicial opinions and precedents established in previous cases to guide their rulings. This body of law evolves as courts make new decisions and refine legal principles, making it particularly significant in areas not directly covered by statutes.

Judicial law, while closely related, generally refers to legal principles established through judicial decisions. Common law encompasses a broader tradition of evolving legal precedents that can fill gaps when no statutory or constitutional provisions exist. Statutory law consists of laws enacted by legislative bodies, while administrative law involves regulations created by governmental agencies. Neither of these options applies when there is a lack of constitutional or statutory provisions in a case.