Conn. Gen. Stat. § 53-209a

Any person who fabricates, in any manner, (1) a weapon designed or intended to cause death or serious physical injury by the release, dissemination or impact of toxic or poisonous chemicals or their precursors, (2) a weapon involving a disease organism, or (3) a weapon designed to release radiation or radioactivity at a level dangerous to human life, other than a person engaged in the manufacture of such weapons for lawful purposes, shall be guilty of a class B felony.