The Stun Knife, developed by the CIA, was used by Solid Snake during the Guns of the Patriots Incident in 2014. It was able to be used directly as a stabbing weapon, or utilized for CQC. In addition, the Stun Knife had the ability to unleash a powerful yet non-lethal electric charge through the blade, allowing Snake to stun enemy soldiers instead of killing them. The electricity is generated from the back of the blade. This technique was used on Snake when Liquid Ocelot used CQC to force Snake to stab himself.
Upon recruiting Old Snake in Metal Gear Solid: Portable Ops Plus, the stun knife can also be procured. The Stun Knife's design was derived from the shocknife, which is a training knife, although without cutting ability.
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Snake using the Stun Knife on a soldier.