In comparative and domestic case law, individuals are often being criminally prosecuted for actions that also contain elements of misdemeanours or other administrative or disciplinary offenses, for which they have already been trialed and even punished. This is evidentially a violation of the ne bis in idem principle, which represents not only one of the basic pillars of criminal law, but also internationally protected human right. Therefore, through analysis of the case law of the European Court of Human Rights, in particular Milenković v. Serbia case, together with the stands of domestic courts on the topic at hand, it will be illustrated that inadequate application of the prohibition against double jeopardy necessarily leads to inadequate criminal protection, shortage of just satisfaction for victims and undermining of legal certainty.