Forensic Scientists assigned to the Biology Unit examine evidence for biological substances and analyze samples to obtain a DNA profile. The Biology Unit compares known profiles from victims and/or suspects to evidentiary sample profiles for inclusion or exclusion in a case. The profiles are then entered into the Combined DNA Index System (CODIS). CODIS compares evidence from one crime scene to another as well as arrestee and convicted offender profiles nationwide. Members of this unit provide expert witness testimony in court regarding their findings in the areas of Serology (body fluid identification) and DNA.