This is a greatly simplified case, because we have assumed that the temperature of the corpse was constant, and that the information on the development of the fly was obtained at that temperature. But there are also methods for transforming data taken at one temperature to their value at another temperature, and methods for analyzing data in relation to variable temperatures. These methods are way to complex to even try to explain or go into. Also, Entomological evidence can help determine the circumstances of abuse and rape. Victims that are incapacitated (bound, drugged, or otherwise helpless) often have associated fecal and urine soaked clothing or bed dressings. Such material will attract certain species of flies that otherwise would not be recovered. Their presence can yield many clues to both antemortem and postmortem circumstances of the crime. Currently, it is now possible to use DNA technology not only to help determine insect species, but to recover and identify the blood meals taken by blood feeding insects. The DNA of human blood can be recovered from the digestive tract of an insect that has feed on an individual. The presence of their DNA within the insect can place suspects at the know location within a definable period of time and recovery of the victims blood can also create a link between perpetrator and suspect.
When estimating the PMI, climatological data about the crime scene is absolutely critical. The length of the insect life cycle is determined mostly by temperature and relative humidity in the environment development takes place. The following climatological data should be collected at the scene.
Ambient temperature can be evaluated be taking readings at 0.3 to 1.3 m heights in close proximity to the body.
Ground temperature can be obtained by placing the thermometer on the ground, immediately above any ground cover.
Body surface temperatures should be obtained by placing the thermometer on the skin surface.
Res Natural The entomologist will not be able to give you an exact time of death, but rather an estimate. ... you find on a dead body can tell a forensic entomologist how long the body has been dead. ... Also, Entomological evidence can help determine the circumstances of abuse and rape. ...