Associate Professor of the Department of Police Activity and Public Administration, Faculty № 3 Lieutenant Colonel Maryna Kalashnyk together with the inspector of the Department of Juvenile Prevention, Department of Prevention Activity of MDNP in Kharkiv region Police Captain Oleksandr Salo conducted a preventive lesson for students of Kharkiv Gymnasium № 6 "Mariinska Gymnasium" of Kharkiv City Council, Kharkiv region on topic “Pranks or Offenses” (http://univd.edu.ua/uk/news/12130).