This article aims to discuss the most important aspects regarding the fundamental human right to freedom and security, a right acknowledged by national law and other international documents. At the beginning of our analysis, we discussed the opinions of some well-known philosophers regarding the concept of freedom and the international documents which regulate the right to freedom and security of a person. Furthermore, we analyzed the provisions of article 23 of the Romanian Constitution and the provisions of the Criminal Procedure Code which regulates the prevention measures with their corresponding regulations in the fundamental law: search, detain and arrest. We have also discussed the provisions of article 5 of the European Convention on Human Rights. At the end of our analysis, we mentioned the significant importance of the right to freedom and security, as a fundamental right of a person.