In 1975, The CIA revealed a secret Heart Attack Gun that used frozen water and a shellfish toxin. Once the dart would melt, the only evidence would be a small red mark.

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sometimessober

Pretty sure it stopped after revealing in congressional testimony

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In 1975, The CIA revealed a secret Heart Attack Gun that used frozen water and a shellfish toxin. Once the dart would melt, the only evidence would be a small red mark.

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