The Folketing lay down their own rules of procedure, subject to the requirements in the Constitution. Among those, the required quorum of 90 members of the Folketing, and the rule that every proposed law requires three readings in the Folketing, before it can be passed into law. The Folketing also have the responsibility of holding the government accountable for the governance. The members of the Folketing does this by submitting questing to the ministers and convene them to explanatory hearings. In addition, the Folketing elect a number of "State Auditors" (), who has the responsibility to look through the public accounts, and check that everything is okay, and that the government only spend money approved by the Folketing. Furthermore, the Folketing also appoints an ombudsman, who investigates wrongdoings by the public administrative authorities on behalf of the public. The Courts of Denmark are independent of the other two branches. The Constitution does not stipulate how the courts are to be organized. Instead, this is regulated by statute. In the normal court system, there are 24 District Courts, High Courts and the Supreme Court. In addition to these, there is some special courts. There are certain rights in the Constitution with respect to the judiciary system. There is a special Court of Impeachment, which can prosecute ministers for their official acts. The court system is able to perform judicial review of laws, i.e. check if they are constitutional. This right is not included in the constitution, but was established by the Supreme Court in the beginning of the 20th century, when it decided to hear cases about the constitutionality of land laws. While this right was contested in the beginning, the political system eventually accepted it. The Supreme Court have been reluctant to rule laws unconstitutional; the only time it have done so was in 1999, when it found that the Tvind law breached the principle of separations of power. Cases about the constitutionality of laws can only be initiated by people directly affected by the laws. All can do this with respect to the Danish relation to EU, because of its wide effects on society. The Evangelical-Lutheran Church of Denmark is the state church established by the Constitution. The queen have a number of duties in the Church of Denmark, and is often considered its head, but this is not a formal role in any way. The state auditors are responsible for checking the public accounts. They are supported by Rigsrevisionen. The Parliamentary Ombudsman is an independent institution under the Folketing, in charge of investigating and inspecting public authorities.