The Klingon law reference article from the English Wikipedia on 24-Apr-2004
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Klingon law

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In the fictional Star Trek universe, Klingon law is that law code which is used in the Klingon Empire. A large proportion of what we know of the Klingon law code comes from the film Star Trek VI, in which an assassination trial is witnessed, and the episode, The House of Quark, in which Quark accidentally kills a Klingon.

The Klingon law code is rather similar to that of the Federation, with a few key differences: