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    <subfield code="e">a law enforcement tool</subfield>
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    <subfield code="a">Dispon&#xED;vel em: https://www.policechiefmagazine.org/magazine/index.cfm?fuseaction=display_arch&amp;article_id=359&amp;issue_id=82004</subfield>
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    <subfield code="a">O sistema de vigil&#xE2;ncia por televis&#xE3;o em circuito fechado (CCTV) tem vindo gradualmente a ser utilizado pelas for&#xE7;as policiais em determinadas &#xE1;reas da seguran&#xE7;a, sendo considerado um instrumento de grande utilidade. No artigo descreve-se como as for&#xE7;as policiais do Canad&#xE1; recorrem a este sistema; como o v&#xED;deo ajuda os investigadores e como a prova obtida por este meio se pode tornar v&#xE1;lida em tribunal. Identificam-se igualmente algumas estrat&#xE9;gias destinadas a fazer o melhor uso deste instrumento ao servi&#xE7;o da investiga&#xE7;&#xE3;o criminal.</subfield>
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