Former CIA employee Mary Embree discusses the infamous heart attack gun. The weapon was first made public during the Church Committee hearings in 1975. Very lethal and untraceable, using this weapon a murder is made to look natural. There is little doubt that the CIA has most likely improved upon it since the 1970’s.

Although the heart attack was first revealed to large parts of the public through the Church Committee in 1975, the research behind this gun is much older.

The CIA had a relationship with the Special Operations Division at Fort Detrick since May 1952 and from there obtained poison dart guns and similar items. Such guns, as the heart-attack gun could look like a pistol, but there were also versions which were disguised as a cane, fountain pen, or umbrella.

This clip is an excerpt from “Secrets of the CIA” 1998

Those darts could be coated with various toxins. AFAIK the name of the alleged untraceable cardiotoxin (it could probably be detected with modern methods anyway,) was never given to the public by Mary Embree.

An Applied Science and Analysis newsletter goes into great detail as to the actual chemical composition of the chemicals most likely used.

It is possible that Mary Embree was talking about Saxitoxin. Here is how high doses of Saxitoxin effect the heart of cats: Toxic effects, pharmacokinetics, and clearance of saxitoxin, a component of paralytic shellfish poison (PSP), in cats.