The September 11, 2001, attacks on the World Trade Center and the Pentagon have drawn attention to the security of many institutions, facilities, and systems in the United States, including the nation’s water supply and water quality infrastructure. These systems have long been recognised as being potentially vulnerable to terrorist attacks of various types, including physical disruption, bioterrorism/chemical contamination, and cyber attack. Damage or destruction by terrorist attack could disrupt the delivery of vital human services in this country, threatening public health and the environment, or possibly causing loss of life. This book discusses the tools of terrorism, not only our water infrastructure; but also commercial vehicle security, bioterrorism, maritime security and WMD proliferation.