Research Article Open Access Volume 1 • Issue 1 • 1000104 Entomol Ornithol Herpetol ISSN: 2161-0983 EOH an open access journal Open Access Review Article Entomology, Ornithology & Herpetology Kapil Verma and Reject Paul, Entomol Ornithol Herpetol 2013, 2:1 http://dx.doi.org/10.4172/2161-0983.1000104 Keywords: Drugs; Insects; Decomposed bodies; Forensic entomol- ogy; Postmortem interval (PMI); Medico-criminal investigations Introduction Forensic Entomotoxicology includes the study of the efects of drugs on the development rate of carrion-feeding insects [1], and the use of these as alternative sample in the absence of other tissues. Most forensic Entomotoxicological studies have concentrated on commonly prescribed drugs. Insect specimens collected from decomposing bodies enable forensic entomologists to estimate the minimum post-mortem interval (PMI). he most common application of entomological evidence in forensic medicine [2] is the estimation of the time of death, i.e., of the decomposing interval [3-7]. here are additional applications which include determination of the place of death, cause of death or detection of an ante mortem trauma [8-15]. Insects: a resource for investigating drug consumption he accurate estimation of the postmortem interval is extremely critical to the successful completion of death investigations. At the present time, there are several methods available for estimating the postmortem interval. Forensic entomology is the well-researched method of determining the time since death in the later postmortem interval. In forensic entomology, the arthropod evidence associated with the corpse is most oten used to estimate the elapsed time since death, or postmortem interval. At present, there are two approaches available for estimating the postmortem interval using insect evidence, and the application of either one largely depends on the state of decomposition of the corpse at the time of discovery by humans. he irst method involves the analysis of the pattern of colonization of the carrion by successive waves of insects and other arthropods. he second method relies on the development of immature lies that are deposited on the carrion shortly ater death. he use of either approach will also depend on factors such as season, climate, and location of the corpse and treatment of the corpse. Furthermore, insects may serve as important alternative species for toxicological analysis in cases where human samples are not available for this purpose. Several publications have described the detection of toxic and controlled substances through analyses of arthropods [16- 20] including diferent drugs. Drugs within a corpse may afect the development rate of insects [21] that feed on them For examples drugs and poisons like Morphine [14], heroin [17], Opiates [22,23], cocaine *Corresponding author: Kapil Verma, Amity Institute of Forensic Sciences (AIFS), Amity University, Noida-201303, Uttar Pradesh, India, Tel: +91-9717717119; E-mail: forensic.kapilalert@gmail.com Received March 25, 2013; Accepted April 10, 2013; Published April 12, 2013 Citation: Kapil Verma, Reject Paul MP (2013) Assessment of Post Mortem Interval, (PMI) from Forensic Entomotoxicological Studies of Larvae and Flies. Entomol Ornithol Herpetol 2: 104. doi:10.4172/2161-0983.1000104 Copyright: © 2013 Kapil Verma, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. Assessment of Post Mortem Interval, (PMI) from Forensic Entomotoxicological Studies of Larvae and Flies Kapil Verma*, Reject Paul MP Amity Institute of Forensic Sciences (AIFS), Amity University, Noida-201303, Uttar Pradesh, India [16], barbiturates [7], clomipramine, amitryptiline [19], nortriptyline, levomepromezine and tioridazine [5,6], Diazepam [24], hydrocortisone, Sodium methohexital [25], Methadone [26], methamphetamine [27], phencyclidine [28] and Malathion [29] are commonly involved in cases where forensic entomology is used. Normal life cycle of ly is shown in table 1. Commonly used techniques for sample detection As for drug related deaths, gas chromatography and mass spectrometry can be performed on the ly larvae [30] to test for the presence of phencyclidine, cocaine, heroin, amitryptiline, and methamphetamine. Drugs such as amitryptiline and nortriptyline can also be detected by extracting material from the ly and beetle pupae casings, and beetle droppings using acids or bases. Selective determination of morphine in the larvae of Calliphora stygia (Fabricius) (Diptera: Calliphoridae) using acidic potassium permanganate chemiluminescence detection coupled with low injection analysis and High-Performance Liquid Chromatography (HPLC). Presence of amitryptiline and nortriptyline could be detected in larvae from all colonies fed on tissues from the rabbits receiving amitryptiline using high-performance liquid chromatography (HPLC) [31]. Calliphora Vicina larvae reared on artiicial foodstufs concentrations of amitryptiline and nortriptyline, alone and in various combinations, were harvested at various stages of development and analyzed for drug content by high-pressure liquid chromatography (HPLC) and gas chromatography-mass spectrometry (GC-MS. Presence of amitryptiline and nortriptyline could be detected in larvae from all colonies fed on tissues from the rabbits receiving amitryptiline using high-performance liquid chromatography (HPLC). Abstract Current research involving studies of the effects of drugs on ly’s development has also allowed better estimations of Postmortem Intervals (PMI) or cause of death. Insects’ specimen collected from decomposing or decomposed bodies enable forensic entomologists to estimate the minimum Post-Mortem Interval (PMI) or cause of death. Drugs within a corpse may affect the development rate of insects that feed on them. This study consequently points out the possibilities of analyzing insects, larvae and pupae or empty pupa cases when suitable tissues or other source of information’s are absent. This study investigated the effects of commonly abused drugs on growth rates of insects. These results can be used by the forensic entomologist in forensic entomology for the postmortem interval (PMI) estimation or cause of death of decomposed bodies or tissues in medico criminal investigations.