Introduction To Forensic Science Practice Test

The key idea here is using the biology of insects to clock the time since death. In forensic entomology, investigators look at which insects are on the body and what developmental stage they’re in, because different species arrive and progress through life stages in a predictable way after death. By identifying the species and assessing whether they’re eggs, larvae, pupae, or adults, and then applying known growth rates that depend on the environmental conditions the body has experienced, a timeline can be back-calculated to estimate how long the body has been exposed to those insects. This approach relies on the temperature-dependent nature of insect development and the usual sequence of colonization, making it a more reliable method for PMI than measurements that don’t account for biology over time. Other options don’t fit because soil or weather patterns don’t capture the biological clock of insect development, DNA analysis identifies who the remains are but not how long they’ve been there, and measuring body temperature alone cannot provide accurate PMI across all stages of decomposition due to varying cooling rates and environmental factors.