Final answer:
Forensic entomologists contribute to criminal investigations by estimating the time elapsed since death through the study of insects present on human remains, examining their development stages, and analyzing DNA from insect larvae to gather more information about the circumstances of the crime.
Step-by-step explanation:
Forensic entomologists apply their expertise in entomology to assist with criminal investigations by analyzing insect evidence collected from crime scenes. Their work involves determining the post mortem interval (PMI) which estimates the time that has elapsed since the death of an individual. This is done by examining the development stages of insects, such as blowflies and beetles, which are among the first to colonize decomposing remains. This evidence is used in conjunction with other forensic methods, such as toxicology and DNA analysis, to piece together the story of a crime.
Forensic entomologists also use knowledge of insect behavior and life cycles to understand changes in a corpse's condition over time, which can indicate the circumstances of death, whether the body has been moved post mortem, and even seasonality or geographical indicators based on the types of insects present. Moreover, through analysis of DNA found in insect larvae, they can identify what the victim may have ingested before death or provide insights into the environment where a crime took place. These findings are critical as they can corroborate other investigative elements and are presented in court to aid the legal process.