Detention is a depriving of liberty of a person by the authority of a government or a country, usually the police. Such depriving liberty is allowed only in the case that the person can considered to have committed a crime. Other depriving liberty is called arbitrary detention and prohibited by article 9 of the Universal Declaration of Human Rights and International Covenant on Civil and Political Rights. And even detention is done legally, the person must be treated with humanity and respected the person's dignity according to the Convention against Torture. 