What type of cases are noted to have the highest percentage of DNA evidence?

The highest percentage of DNA evidence is found in rape or sexual assault cases. This is primarily due to the nature of these crimes, which often involve physical interaction between the perpetrator and the victim. In such cases, biological materials such as bodily fluids, hair, and skin cells are frequently left at the crime scene or transferred to the victim, providing a rich source of DNA evidence for investigators.

This biological evidence can be crucial in identifying suspects and establishing connections between the crime scene and the individuals involved. The relationship between the evidence created in these cases and the potential for DNA recovery is much stronger than in other types of crimes, where evidence collection might not yield such biological materials. Consequently, sexual assault cases typically exhibit a higher prevalence of DNA evidence than theft, burglary, or assault cases, where such biological interactions are often less direct or not present at all.