this story is well over 30 years old, but relevent in showing that a secret national security state exists and is able and willing to disppose of political dissidents and witnesses to crimes of the state.
In 1975 this formerly secret CIA weapon was declassified. The information about this weapon comes from U.S. Senate testimony in 1975 relating to rogue activities of the CIA. This video shows actual Congressional testimony explaining how the Heart Attack Gun works. The Heart Attack Gun shoots a small poison dart that is made of ice. The poison causes a heart attack. Then the dart melts and the poison denatures so there is nothing that shows up in autopsy.
Via-Police State USA