"The Department of Criminalistics at the Faculty of Law and Administration of the University of Silesia in Katowice has been studying the polygraph examinations for exactly 30 years now. The Department has conducted many scientific studies in this area and the staff have also provided expert opinions for use by law enforcement agencies. The purpose of this article is to present the problems our staff currently encounter in working with the polygraph within Polish criminal procedures and to present practical examples illustrating some selected problems. The article begins with a brief description of the history of the polygraph examinations in the Department."(...)