The focus of this article is critical of preventive detention laws in Pakistan, however, with special reference to the Actions In Aid of Civil Power Regulation (AACPR) that was designed to tackle terrorist insurgency in Federally Administered Tribal Areas (FATA) and Provincially Administered Tribal Areas (PATA). The regulation introduced to contain militancy is profoundly worrying because granted the military broad powers, of detention without trial, amongst others, which could seriously endanger human rights and international law. The article delves into the implications of International Humanitarian Law (IHL) and International Human Rights Law (IHRL), particularly in the context of preventive detention and internment procedures under the AACPR. It critically reviews potential violations of constitutional guarantees and Pakistan's international human rights obligations. The study fills in a legal gap and proposes reforms in view of the regulation relating to global human rights standards through an analysis of case law and international conventions.