Which factor is NOT typically considered a source of authority?

The concept of sources of authority in law typically encompasses formal documents and institutional frameworks that establish legal rules and standards. The Constitution, regulations, and statutes are all formal, codified sources that provide clear guidelines for legal interpretation and enforcement.

In contrast, public opinion serves as an informal, societal influence rather than a direct source of authority. It does not carry the weight of law in the way that the Constitution, statutes, or regulations do. While public opinion can affect lawmakers and may influence legal reforms, it is not a formal source that establishes binding legal norms. Therefore, public opinion, unlike the other options, is not recognized as a source of authority in the legal context.