The day after a CNN investigation uncovered airport employees access airplanes and tarmacs without undergoing daily security screening, officials admitted that no one checks criminal backgrounds after workers are hired.
원문출처 : http://edition.cnn.com/2015/02/03/us/airport-security-gaps/index.html?eref=edition
원문출처 : http://edition.cnn.com/2015/02/03/us/airport-security-gaps/index.html?eref=edition