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Kinjutsu (禁術; Maksud secara harfiah"Teknik Terlarang")are techniques that have been banned from being taught. This ban can have been put in place for any number of reasons, but kinjutsu can generally be put in either of two categories:

Techniques that do extreme harm to oneself (e.g. the Multiple Shadow Clone Technique, which will bring almost any user to the brink of death by mere use),

Techniques that violate the Laws of Nature. (e.g. the Summoning: Impure World Resurrection, which resurrects the dead with a human sacrifice)

Despite their being banned, the use of these techniques generally does not carry any legal consequences in respects to the village they're use in, except those brought on by the techniques themselves. However, their use is heavily frowned upon, especially those techniques that violate Nature. Kinjutsu are usually either A-rank or S-rank.