Arthropods are the most common species on the planet and play an important role in the decomposition of a corpse. Forensic Entomology relies on entomological examination of species typically associated with carrion to provide crucial insights into investigations. Entomological data has contributed to the resolution of various medico-criminal cases from the beginning of time. By analyzing either the species of arthropods present or their age and developmental stage, the post- mortem interval can be accurately determined. The present paper discusses the historical development and the utilization of forensic entomology in crime investigation, including the various uses of entomological evidence, information about crucial species of arthropods, as well as the techniques of determining the PMI using insect evidence. The paper also presents an argument about the need for congruence of the theory of forensic entomology and actual cases on the ground. The need to tackle ground level issues such as, law enforcement agencies being skeptical about the potential of this field and the collection of evidence being done in a careless manner have been discussed. Various international and national cases are presented as well, in order to depict the usage of this branch and the loopholes which need to be tackled for promoting this niche branch of forensic science.