Abstract: The subject of this research is the non-random variability of dermatoglyphic characteristic of sampling analyzed in forecasting criminalistics. The last decades’ research result testify to the specificity of fingerprint patterns of the persons prone to deviant and addictive behavior as compared to the control groups. However, the characteristics of control sampling are not completely random. Part of the people always elude from volunteer participation in the study and fingerprinting due to the reasons of psychological nature, first and foremost related to their individual dermatoglyphic profile. The research established 50 different dermatoglyphic patterns in 18 various ethnic groups. It is demonstrated that the participants who have been examined last differ greatly from the first volunteers by higher frequency of occurrence of the simple typical whorls; perhaps, they are also less psychologically motivated and emotionally disturbed. Samplings formed on the principles of volunteer participation of the respondents are comparable to each other only in case of exerting equal psychological pressure upon the potential participants. Such may be applied as control samplings in analyzing the samplings consisting of persons subjected to mandatory fingerprinting (alleged offenders, convicts).