INTRODUCTION 6 1.2.1. MAIN OBJECTIVE The objective of this research study is two-fold, as follows: 1. To analyse national standards applicable to defendants and detainees with intellectual and/or psychosocial disabilities in Lithuania; 2. To assess the implementation and practical application of the Framework Decision on the European Arrest Warrants in relation to persons with intellectual and/ or psychosocial disabilities, with a focus on systemic issues that may hinder EU crossborder cooperation. This research study was exploratory in nature, since very little had been known about the topic in question, and this was the very first ever study on this topic in Lithuania. Desk-based research and analysis of legislation, policy, regulations, other resources, and case-law was complemented by semi-structured interviews, official Freedom of Information requests to relevant institutions, and a national roundtable discussion.