Entomology is the study of insects. Forensic science uses these insects to gather important data about a crime. Insects could be used to help determine time of death, location of death, poisons or other drug use, child abuse, and more. As you can see, those little bugs can be quite useful to a criminal investigator.
Education through Entomology - use this Rasmussen College site to learn more about the many aspects of forensic entomology.
Crime Scene Creatures - watch some neat (and creepy) videos and determine time of death at an interactive crime scene.