A CIA secret weapon used for assassination shoots a small poison dart to cause a heart attack, as explained in Congressional testimony in the short video below. The dart from this secret CIA weapon can penetrate clothing and leave nothing but a tiny red dot on the skin. On penetration of the deadly dart, the individual targeted for assassination may feel as if bitten by a mosquito, or they may not feel anything at all. The poisonous dart completely disintegrates upon entering the target.