Loading presentation...

Present Remotely

Send the link below via email or IM

Copy

Present to your audience

Start remote presentation

  • Invited audience members will follow you as you navigate and present
  • People invited to a presentation do not need a Prezi account
  • This link expires 10 minutes after you close the presentation
  • A maximum of 30 users can follow your presentation
  • Learn more about this feature in our knowledge base article

Do you really want to delete this prezi?

Neither you, nor the coeditors you shared it with will be able to recover it again.

DeleteCancel

Make your likes visible on Facebook?

Connect your Facebook account to Prezi and let your likes appear on your timeline.
You can change this under Settings & Account at any time.

No, thanks

Forensic Entomology

No description
by

Kimberlee Sue Moran

on 7 July 2014

Comments (0)

Please log in to add your comment.

Report abuse

Transcript of Forensic Entomology

Fly Life Cycle
Postmortem Interval
Algor mortis
Change in temperature after death
Most useful indicator of the time of death during first 24 h
Livor mortis / Hypostasis
Settling of blood in the body gives off a bluish-purple colour
The area where the blood collects goes reddish-purple
Rigor mortis
Stiffening of the muscles after death
Autolysis
Tissue breakdown by the body's own internal chemicals and enzymes
Putrefaction
The breakdown of tissues by bacteria. These processes release gases that are the chief source of the characteristic odour of dead bodies.
Mummification
Dehydration or desiccation of tissues
Time of Death Determination
Concerns the use of arthropod evidence in solving crimes –most often crimes of violence

May involve:
Deliberate homicide or assault using insects
Cases of unexplained death - E.g. anaphylaxis from bee stings
Causation of traffic accidents - E.g. wasp in a vehicle
But more commonly:
Estimation of time of death - “Postmortem interval” PMI
And less often –site where death occurred.
Medicocriminal Entomology
Disputes over arthropods and arthropod parts in food and other products
Insect debris in breakfast cereal
Caterpillars in cans of vegetables
Fly maggots in sandwiches from fast-food restaurants
“planted” with intent to defraud…
Stored Product Entomology
Human environments
Problems involving cockroaches and other pests
Termites
Lawsuits on damage, extermination, real estate value
Also includes Rural Entomology -Insect nuisance related to agricultural endeavors
Flies from livestock and insects in cattle feedlots, poultry houses and pig farms.
Patients in hospitals with
myiasis
Neglect claims
Mortuary neglect –maggot infested corpses
Urban Entomology
What is it? - Interaction between arthropod science and judicial system
3 Types:
Urban Entomology
Stored Products Entomology
Forensic Medical Entomology / Medico-criminal entomology
Forensic Entomology
Forensic Entomology
American Board of Forensic Entomology
Quality assurance mechanism
Diplomate
Educational and performance criteria
PhD in medical entomology
Involvement with and contribution to both research and case work in medicocriminal entomology.
Ability to qualify as an expert witness
Peer recommendations, committee screening, approval of Board, Certification Examination
Continuing education
Membership in the ABFE
The Profession
Observe maggots & take samples
Preserve maggots
Measure maggots
id species via instars and spiracles
Find out temperature & weather
Find out growth rate
Figure out PMI
How it's done
Temperature–Dependent Development
Insects are cold blooded.
Rate of development is more or less dependent on ambient temperature
For each species there is a threshold temperature below which no development occurs
As temperature rises above this threshold, a certain amount of time is required for the insect to pass through each life stage.
Development
Saprotrophs
Blow flies (usually Calliphora vomitoria)
Help break down corpse
Help us determine location of deceased and the time since death
Accuracy really important!
Maggots!
Temperature
Access by insects
Burial, and depth of burial
Access by carnivores or rodents
Trauma, including wounds and crushing blows
Humidity, or dryness
Rainfall
Body size and weight
Prior embalming
Clothing
The surface the body rests on
Variables Affecting Decomposition
Triazolam - benzodiazepine
Oxazepam - benzodiazepine
Alimemazine - (sedating) antihistamine
Chloripriamine - antihistamine
Phenobarbitol - anticonvulsant
Malathion - insecticide
Mercury
Amitriptyline - antidepressant
Nortriptyline - antidepressant
Cocaine
Phenycyclidine (PCP)
Heroin
The following list of chemicals has been traced in maggots:
(This can cause problems with inhibition or enhancement of life-stage duration.)
Unexplained Death
Forensic Entomology
Time of Death Determination
Corpse Fauna
Forensic Evidence
Sampling techniques
Careers
Overview
Spiracles & Instars
Full transcript