"I want to stress, I am respectful and cognizant of the privacy concerns," referring to protests against a US drive to use full body X-ray scans at airports.
"Respect for privacy is a value we share. But all countries have unique legal traditions, cultural differences, and political realities.
"I believe that we should not allow these differences to keep us from working toward a common goal and a deep and stronger partnership with respect to security and privacy," she said.
Civil liberties groups and Muslim groups have protested the move, because the body scanners provide full-body imaging.
Napolitano went on to say that producers of the body scanners are already working on developing new machines that take privacy into consideration.
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