A primary authority is a legal source that establishes the law, such as statutes, regulations, court decisions, and constitutions. These binding materials are essential for legal practitioners because they directly state what the law is and must be followed in legal decisions and arguments. Primary authorities are invaluable to legal practitioners as they provide the enforceable rules and principles governing legal issues. Lawyers rely on these sources to ensure their arguments are grounded in the law, building strong, credible cases and persuading judges and opposing counsel of their legitimacy. For instance, when drafting a legal brief, a lawyer will review relevant statutes and precedent-setting court decisions to support their case. In regulatory compliance, lawyers examine specific regulations and statutes to provide accurate guidance to their clients. During litigation, lawyers analyze court decisions that set precedent for their legal issues to predict outcomes and formulate arguments. This review is also critical in appeals, where lawyers must show how the trial court may have misinterpreted or misapplied the law