Week 4 Evidence Recovery (lab1) PDF
Document Details
Uploaded by ProudVorticism4929
University of Portsmouth
Tags
Summary
This document is a workshop for a module on forensic science, focusing on evidence recovery. The workshop aims to expose students to various forensic evidence types. Students have to identify the appropriate forensic evidence to locate in a crime scene and present to the class.
Full Transcript
CSFI – Week 4 – Workshop 1 EVIDENCE RECOVERY Module Coordinator – Dr Deborah Ryder [email protected] Workshop tutors: Jodie Coulston, Carolyn Lovell, Aaliyah Norat, Deborah Ryder WORKSHOP AIMS To consider the variety of items, with forensic potential, that mi...
CSFI – Week 4 – Workshop 1 EVIDENCE RECOVERY Module Coordinator – Dr Deborah Ryder [email protected] Workshop tutors: Jodie Coulston, Carolyn Lovell, Aaliyah Norat, Deborah Ryder WORKSHOP AIMS To consider the variety of items, with forensic potential, that might be encountered at a crime scene To develop understanding that multiple forensic evidence types may be present on a single item To consider how or why particular evidence might be found on different items TASK 1 EVIDENCE ASSESSMENT In front of you are a selection of items, working with the people in your group compile a list for each item detailing the evidence types that could be present. Consider the following; DNA - what might the source? Saliva, blood, semen, skin cells, hair… Fingermarks - what type? Latent (invisible), patent (visible), or plastic (3D impressions. If you think there are patent fingermarks what is the contaminant that is making them visible? (i.e. blood, or paint….) Trace Evidence - what is the source of trace evidence? Glass, fibres, soil… TASK 1 DISCUSSION Let us discuss your thoughts Choose one of the items you have discussed and present to the class your thoughts on the evidence that might be present TASK 2 PRE-WORK TABLE COMPLETION WHY MIGHT THIS HAVE FORENSIC ITEM EVIDENCE RELEVANCE? Your pre-work was to complete this table Non-broken unopened bottle Fingerprints Moved by offender within scene Underwear Screwdriver Window frame with broken pane Broken beer bottle Discuss with your group how you completed it Bin bag from a roll Would you amend / add any details now? Crow bar Mobile phone box Frying pan Glove Balaclava Condom Knife Glass below broken window (outside and inside) Piece of finger Piece of fingernail WHY MIGHT THIS BE ITEM EVIDENCE RELEVANT/USEFUL? TASK 2 Latent Fingerprints If moved by offender in scene Non-broken unopened beer bottle DNA (cellular, tDNA, semen, If handled during, and worn after, Underwear hairs), hairs, fibres assault DISCUSSION If left at scene DNA could identify offender; if recovered from offender, Screwdriver DNA (tDNA), paint could link to tool marks or paint at scenes DNA (blood), glovemarks, Window frame with broken pane fingermarks, footwear marks, If broken and entered by offender(s) glass, fibres, hair CASE Example: Criminal damage – if DNA (blood, saliva, tDNA), thrown through window, smashing it. fingerprints (patent and/or Broken beer bottle Could also be used as a weapon latent) If used as a weapon there could also be victim’s blood present CASE example: Burglary – if Offender tore a bag from roll and used it to Lets discuss! Bin bag from a roll Latent fingermarks take items away from scene. Common occurrence CASE example: Burglary: If Used to break into house, and left behind. For Latent fingermarks; DNA example wedged into lawn. An Crow bar (tDNA); Paint; Intelligence offender did this at every scene with a new crow bar Could link to tool marks or paint if used at other scenes CASE Example: Burglary. If ripped Mobile phone box Latent fingermarks open to see if phone inside. Common occurrence CASE: Assault. If used as weapon, Latent fingermarks; DNA victims blood recovered. Many Frying pan (Blood, tDNA) everyday items could be used as weapons CASE example: Burglary. If glove DNA (cellular; hairs); hairs; Glove marks at point of entry, glove fibres; intelligence removed inside, left behind CASE Example: Aggravated burglary. DNA (cellular; hairs) hairs, Balaclava If found in street nearby or pulled off fibres; intelligence in a scene CASE Example: Sexual assault. If Condom DNA (semen and cellular) found at scene DNA (tDNA, blood) latent and CASE example: If used in an assault or Knife patent fingermarks murder CASE example: Burglary. Fingermarks Glass below broken window (outside and Latent footwear marks, latent on glass outside, footwear marks on inside) fingermarks, DNA (blood) glass inside – showing suspect had entered premises CASE example: Criminal Damage. Part Piece of finger DNA (Blood) Ridge detail of finger found in damaged office window CASE Example: Rape. Part of fingernail found at scene (suspect Piece of fingernail DNA, nail varnish house) matched broken fingernail and nail varnish of victim. TASK 3 EXHIBIT RECOVERY When recovering any item as a forensic exhibit, we must ensure we follow a process, in order to ensure the item is not compromised (contaminated, or evidence lost) What do you think is the correct process? Consider in situ Move exhibit exam (swab, Consider if change of Update scene into fingerprint gloves required notes with packaging Move to next powder, tape actions taken exhibit etc..) Complete exhibit list in Take scene notes Seal Complete exhibit label on outside of packaging packaging to (ensuring packaging Include exhibit number, description (&location exhibit description in scene), address, date, name, signature exactly matches Record item label) (photograph &/or notes) TASK 3 ORDER OF RECOVERY Complete exhibit label on Consider in situ outside of packaging Record item exam (swab, Consider if change of Include exhibit number, (photograph fingerprint powder, gloves required description (&location in &/or notes) tape etc..) scene), address, date, name, signature Take packaging to Move exhibit into Seal exhibit packaging packaging Complete exhibit list in Update scene scene notes (ensuring Move to next notes with description exactly exhibit actions taken matches label) ANY QUESTIONS?
