KEBERLAKUAN ASAS NE BIS IN IDEM TERHADAP PUTUSAN PENGADILAN ADAT DALAM TATA HUKUM INDONESIA

The number of cases have been decided and executed by the Customary Court, but are still being processed and tried according to national law. It creates legal uncertainty and tends to conflict with the values of justice and human rights. This tendency is due to law enforcers who prioritize the principle of nullum delictum noella poena sine pravea lege poenali. The criminal law also acknowledges the principle of ne bis in idem for every decided and executed cases, including the Decision of the Adat Court. The result describes that the application of the principle of ne bis in idem to the Decision of the Customary Court has a place in Indonesian law. This can be recognized from the existence of a Supreme Court jurisprudence which states that if a case has been decided by the Adat Court and brought back to court, the Public Prosecutor's indictment must be declared "unacceptable" Niet On vankelijke Verklaark. The implementation of the principle of legality is not only interpreted as nullum delictum sine lege, seen as formal legality, but also as nullum delictum sine ius, material legality by recognizing customary law as a source of law.Keywoords: Ne bis in idem, Verdict, Customary Court.