Criminalists in the Biology section conduct examinations to locate and identify blood, semen, saliva, hairs and other body fluids on items of physical evidence. DNA testing is then performed to determine possible sources of the body fluids identified. To do this, the DNA types obtained from the evidence samples are compared to the DNA types obtained from victim and/or suspect reference samples to determine if the DNA types are the same. DNA profiles from evidence samples are also entered into the state and national DNA databases for comparison to offender DNA profiles and DNA profiles from other evidence samples.
Forensic biology has been used to prove a suspect was at a crime scene, identify illegal products from endangered species, solve crimes by matching crime scene evidence to suspects.