The Parades Commission is a quasi-judicial non-departmental public body responsible for placing restrictions on any parades in Northern Ireland it deems contentious or offensive. It is composed of seven members, all of whom are appointed by the Secretary of State for Northern Ireland. Restrictions it can impose include a prohibition on music being played, re-routing parades to avoid contentious areas, or banning certain participants based on previous breaches of its determinations. Its rulings are usually enforced by either parade stewards or the police, though there are disputes as to whether this is done to the letter of the law in certain areas. The Commission acts under the Public Processions (Northern Ireland) Act 1998.