Ouster clause
An ouster clause or privative clause is, in countries with common law legal systems, a clause or provision included in a piece of legislation by a legislative body to exclude judicial review of acts and decisions of the executive by stripping the courts of their supervisory judicial function. According to the doctrine of the separation of powers, one of the important functions of the judiciary is to keep the executive in check by ensuring that its acts comply with the law, including, where applicable, the constitution. Ouster clauses prevent courts from carrying out this function, but may be justified on the ground that they preserve the powers of the executive and promote the finality of its acts and decisions. Ouster clauses may be divided into two species – total ouster clauses and partial ouster clauses. In the United Kingdom, the effectiveness of total ouster clauses is fairly limited.