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Continue to ChatAs former Homeland Security Secretary Janet Napolitano pointed out, if you build a 50-foot wall, you'll soon be confronted with a 51-foot ladder. You need a strategy that involves layered defense: deployed patrols, sophisticated sensor equipment, and surveillance from the air. That is what has had a positive impact over the last generation. - Alan Bersin from https://whatsmyquote.com/quote/as-former-homeland-security-secretary-janet-napolitano-pointed-out-if-you-build-a-50-foot-wall-you-ll-soon-be