More than 150 years of progres in genetics, currently allows to determine not only the blood type, gender, compare secured DNA with the genetic material of the suspect, but also to determine the physical characteristics of the person, such as eye color, hair color, the predisposition to diseases. The significant contribution it can to improve the detection of the perpetrators of the crime. The possibilities offered by this method are significant, but what are the limitations, ethical and legal status of the use of this new technique of forensic science?