Hooding is the placing of a hood over the entire head of a prisoner. Hooding is widely considered to be a form of torture; one legal scholar considers the hooding of prisoners to be a violation of international law, specifically the Third and Fourth Geneva Conventions, which demand that persons under custody or physical control of enemy forces be treated humanely. Hooding can be dangerous to a prisoner's health and safety. It is considered to be an act of torture when its primary purpose is sensory deprivation during interrogation; it causes "disorientation, isolation, and dread." According to the International Committee of the Red Cross, hooding is used to prevent a person from seeing, to disorient them, to make them anxious, to preserve their torturer's anonymity, and to prevent the person from breathing freely.
In 1997, the United Nations Committee Against Torture had concluded that hooding constituted torture, a position it reiterated in 2004 after the committee's special rapporteur had "received information on certain methods that have been condoned and used to secure information from suspected terrorists."
Hooding is a common prelude to execution.
In the first half of the twentieth century, hooding was rarely used. During World War II, the Gestapo used it especially in the Breendonk prison in Belgium. It became more popular after World War II as a means of "stealthy torture," since it makes public testimony more difficult; the victim can testify only with difficulty as to who did what to them. In the 1950s, hooding was used in South Africa and French Algeria; in the 1960s, in Brazil and Franco's Spain, in the 1970s, in Northern Ireland, Chile, Israel, and Argentina; and since then in a great number of countries.
In some cases, hooding was accompanied by white noise, such as in Northern Ireland; such techniques used by British troops followed up on research done in Canada under the direction of Donald O. Hebb.