In this video, we'll explore the most terrifying weapon ever used by the CIA—the heart attack pistol. Since the 1960s, this weapon has been used to eliminate civilians without leaving a trace. We'll show how, in 1975, a poison used to create the appearance of natural death was discovered in a CIA office, and how this weapon continued to be used in covert operations. Discover how the "heart attack pistol" could become a deadly instrument without any trace of violence.