Heart attack gun? Nah the governent agencies apply a shielding lotion on their skin then apply the topical poson on top of that then shake your hand. It takes a little while to get into your bloodstream then kills you hours later...: )
Well seems that there WAS a heart attack gun. Worked uing shellfish poison:
http://www.wanttoknow.info/a-CIA-shellfish-poison-dart-gun-causes-heart-attack
Maybe Andrew Breitbart could get to the bottom of this story!
Oh...