<P> In a child custody dispute, a court may place restrictions on the movement of a minor child, thereby restricting the ability of the parents of that child to travel with their child . </P> <P> The Visa Restrictions Index ranks countries based on the number of other countries its citizens are free to enter without visa . Most countries in the world require visas or some other form of entrance permit for non-citizens to enter their territory . Those who enter countries in defiance of regulations requiring such documentation are often subject to imprisonment or deportation . </P> <P> Most countries require that their citizens leave the country on a valid passport, travel document issued by an international organization or, in some cases, identification document . Conditions of issuance and the governments' authority to deny issuance of a passport vary from country to country . </P> <P> Under certain circumstances, countries may issue travel documents (such as laissez - passer) to aliens, that is, to persons other than their own citizens . </P>

Freedom of movement universal declaration of human rights