The Prison Knife is used in the mission Vorkuta. Alex Mason acquires it after killing the guard attacking Reznov in the opening scene. The player may use the prison knife for as long as they wish, until the "Shoot the lock" objective. After Mason acquires another weapon, the prison knife is no longer equipped. If the player uses melee after this, Mason will use the standard knife when the player presses the "melee" button.
Aesthetically, it underwent a minor texture adjustment from Black Ops to Mob of the Dead, with the blade seeming less rusted and the hilt less shiny.
Call of Duty: Modern Warfare[]
A Shiv appears in the campaign mission Captive. A different-looking one appears in multiplayer and Warzone as a Weapon Blueprint for the Combat Knife under the name of "Shivvie".
It is impossible to lay down with the Prison Knife; even after diving, Mason will automatically crouch. Strangely, this does not affect the PS3 version of the game.
