In this the author explains the need for security systems and the various kinds of security methods that can be used under different situations/conditions.With dangerous threats facing a global society, the need to balance security with openness, prudence,common sense, and preparation is crucial. Those responsible for public safety have a moral, professional,and legal obligation to remain cognizant of ways to ensure the greatest degree of security within the built environment. Highly effective security can be transparent or invisible to the public eye.
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