Crime scene blood stains can be damning—even after cleaning

Cleaning blood from a violent crime scene can complicate crime scene investigations, particularly when accurate evidence is required for a conviction in court. A new study led by Flinders University, published in the Australian Journal of Forensic Sciences, compares evidence collected from remaining DNA and hemoglobin (red blood cells) left on cotton T-shirt material and metal knives from wet and dried blood cleaned with a variety of different common cleaning products.