So I did some research on forensic entomology. I discovered that it is divided into three categories: urban entomology (involving insects that affect manmade structures and the human environment), stored products entomology (involving insects infesting stored products, such as food), and medicolegal entomology (referred to as medicocriminal entomology, involving insects that feed on decaying corpses).
Most of the information I found on forensic entomology was about determining the postmortem interval (PMI) of a victim. Depending on location, climate, weather, and time of day, different insects will be found on a decaying corpse. Also because adult flies first have to lay eggs on a body, the presence of eggs or larvae (maggots) means that the death wasn’t very recent.