The PCR technique has become a powerful and very sensitive tool in a broad field of research, that is, molecular biology, medical diagnostics, population genetics, ancient DNA analysis and forensic casework.
However, the high sensitivity down to single molecules can easily cause false-positive PCR results due to different types of contamination. In this study, artificial DNA contaminations (saliva and pure DNA) were treated with UV irradiation and other decontamination procedures. A satisfactory DNA removal could not be achieved, emphasizing the necessity of contamination avoidance.