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Legal opinion

Written interpretation of the law as applied to a particular question or case

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Through Law, Jurisdiction and Judge

In jurisdictions where legal opinions are prepared by judges, they usually published at the direction of the court, and to the extent, they contain pronouncements about what the law is and how it should be interpreted, they reinforce, change, establish, or overturn legal precedent. If a court decides that an opinion should be published, the opinion may be included in a volume from a series of books called law reports ('reporters' in the United States). Published opinions of courts are also collectively referred to as case law, and constitute in the common law legal systems one of the major sources of law.

In jurisdictions where a legal opinion refers to the work of a lawyer, not a judge, the opinion is usually covered by solicitor-client privilege and is not public. The lawyer provides the opinion to their client, to assist the client in deciding what course of action to take.

Judicial opinions

Not every case decided by a higher court results in the publication of an opinion; in fact, many cases do not, since an opinion is often published only when the law is being interpreted in a novel way, or the case is a high-profile matter of general public interest and the court wishes to make the details of its ruling public.

In the majority of US cases, the judges issue a memorandum decision that indicates how state or federal law applies to the case and affirms or reverses the decision of the lower court. A memorandum decision does not establish legal precedent or reinterpret the law, and cannot be invoked in subsequent cases to justify a ruling. Opinions, on the other hand, always establish a particular legal interpretation.

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