Archived Content Information identified as archived on the Web is for reference, research or recordkeeping purposes. It has not been altered or updated after the date of archiving. Web pages that are archived on the Web are not subject to the Government of Canada Web Standards. As per the Communications Policy of the Government of Canada , you can request alternate formats on the " Contact Us " page. Preface The following study, based entirely on open sources, was on the verge of being completed at the time of the Tokyo subway attack in March 1995. As a result, a fairly lengthy "Postscript" has been added to it, incorporating material about the Tokyo attack and subsequent incidents. The main body of the text has not otherwise been altered, however. Introduction Most of the literature on possible terrorist use of weapons of mass destruction has focused on so-called "nuclear terrorism." Entire books have been written on the subject. Even segments of the public at large are aware of certain aspects of this question, such as the existence of the US Nuclear Emergency Search Team (NEST) designed to counter threats or acts of nuclear terrorism. By contrast, comparatively little information can be found in the public domain on the possible terrorist use of chemical or biological agents, even though most specialists agree that the likelihood of such use is greater than in the case of nuclear materials. For the most part, speculation about "CB terrorism" has been dealt with perfunctorily within broader