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. ==Legal opinions of counsel or government law officers==