In recent five or ten years in a criminalistic scientific community there has been a clearly evident scientific discussion on a criminalistics science theory, criminalistics system, matter of criminalistics and a relation of criminalistics science to other scientific fields, primarily to forensic sciences with whom criminalistics is closely connected. Due to proceeding scientific knowledge and research of these scientific fields in past times somewhat related to criminalistics this relation has been deepen step by step. Criminalistics also uses parts of knowledge from other sciences in their unaltered form. It concerns mostly forensic sciences, such as forensic medicine, forensic psychiatry, forensic psychology, forensic engineering and recently also forensic biomechanics.