This study aims to determine how the effectiveness of the implementation of Article 57 of the Compilation of Islamic Law in relation to polygamy permits due to adultery resulting in pregnancy. This research uses empris research method with Sociological Jurisprudence approach. The result of this research is that the application for polygamy permit in Decision Number: 904/Pdt.G/2018/PA.Gtlo, does not fulfill the alternative requirements as a reason for polygamy, only fulfills the cumulative requirements. According to the author, the applicant's reason for wanting to be polygamous on the grounds that the prospective second wife is currently 8 months pregnant violates the provisions of Article 4 of Law Number 1 of 1974 concerning Marriage, Article 41 of Government Regulation Number 9 of 1975 concerning the Implementation of Law Number 1 of 1974 concerning Marriage, and article 57 of the Compilation of Islamic Law
Wahyudin Hasan (Sun,) studied this question.