The Science of Forensic entomology is the study of insects for medico-legal purposes. There are many ways insects can be used to help solve a crime, but the primary purpose of forensic entomology is estimating time since death.
Once a person dies his or her body starts to decompose. The decomposition of a dead body starts with the action of microorganisms such as fungi and bacteria, followed by the action of a series of insects (arthropods). Bodies decompose slowly or fast depending on weather conditions if they have been buried or are exposed to the elements, if there is a presence of insects or if they have a substance in their bodies that prevent their fast decomposition such as body size and weight, clothing.