The article aims at analysing the significance of authentic legal English text and adapted legal texts in ESP classes. The authors point out the advantages and disadvantages of legal texts and analyse the possibilities of their efficient application in the teaching process. At the initial stage of teaching English legalese, materials prepared specially for teaching purposes in textbooks seem to be more appropriate as they are adapted for a particular level for law students whereas in more advanced levels, authentic texts in a legal English classroom can more considerably contribute to the learning experience. The usage of both legal authentic materials and adapted legal texts have tangible impact on mastering legal English.