Spis Treści : Introduction The method Chapter 1. Basic information on polygraph examination 1.1. Examination techniques 1.1.1. Control question technique 1.1.2. “Guilty knowledge test” technique 1.2. Polygraph and the recording technique Chapter 2. Slandering innocent people by the murderer 2.1. Prosecutor’s hypothesis 2.1.1. 1st version 2.1.2. 2nd version 2.2. Verifi cation of the 1st version of the murder 2.2.1. Examination of the main suspect (the would-be father) 2.2.2. Examination of the second suspect (the young man’s father) 2.3. Verifi cation of the 2nd version of the murder 2.3.1. Examination of the victim’s father 2.3.2. Examination of the victim’s sister 2.4. Further investigation versions 2.5. Conclusion of the case Chapter 3. Tragic end of a love affair when the wife was away 3.1. Investigation hypothesis 3.1.1. Examination of a probable witness 3.1.2. Examination of the main suspect 3.2. Conclusion of the case Chapter 4. Gypsies murdered by Gypsies – breaking a tribal taboo 4.1. The prosecutor’s hypothesis 4.1.1. Examination of the fi rst suspect (Jacek D.) 4.1.2. Examination of the second suspect (Szymon G.) 4.2. Conclusion of the case 4.3. Comments ....