<P> Many countries allow police to demand identification and arrest people who do not carry any . Normally these countries provide all residents with national identity cards, which have the identity information the police would want to know, including citizenship . Foreign visitors need to have their passport available to show at all times . In some cases national identity cards from certain other countries are accepted . </P> <P> For example, in Portugal it is compulsory to carry the state ID card at all times . This card named Cartão de Cidadão - Citizen Card is an electronic card which includes biometric information, id number, social security number, fiscal information, place of birth, etc . Police can only ask for the ID card in public or a place open to public and only if there is a reasonable suspicion the person committed a crime . A certified copy of the ID card can be presented in such situations . If a citizen does not carry the ID card or its certified copy, the police will escort the person to the police department to remain detained until clear identification can be obtained . </P>

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