Similarly, the potent nerve agent VX, developed as a chemical weapon by the British military, also asphyxiates its victims by paralyzing the respiratory muscles. Chlorine trifluoride, an ...

Narrator: In 1968, about 6,000 sheep died near this government facility. They were poisoned by a chemical weapon named VX. The US hasn't been known to actively use VX in combat. In fact ...