The non-conventional weapons category comprises various regimes that prohibit possession or the use of weapons which are believed to be unfit for “normal” conventional warfare. This cluster includes a set of regimes usually branded under single rubrics – chemical, biological and nuclear/radiological weapons (CBRN), or weapons of mass destruction by an alternative wording. While destructiveness of many non-conventional weapons can be – at least partially, matched by certain “conventional weapons” they form distinctive category due to a limited record of their use followed by their normative, widely accepted stigmatization and tabooization.