noun
ne bis in idem; double jeopardy prohibition
Legal principle that a person cannot be tried again for the same offense after a final judgment. Used in criminal procedure contexts.
一事不再理の原則により、同じ事件で再び起訴されることはない。
Under the principle of ne bis in idem, one cannot be prosecuted again for the same case.
二重処罰 refers to double punishment in a broader sense, while 一事不再理 is a specific legal doctrine preventing retrial after acquittal or conviction.
Compound of 一事 (one matter) and 不再理 (not re-examine), calque from Latin 'ne bis in idem'.