| | SLO | ENG | Cookies and privacy

Bigger font | Smaller font
First page > Show document

Show document Help

Title:Uspešnost zaznave bioloških in daktiloskopskih sledi s svetlobnimi viri pri preiskavi varnostno zanimivih pisanj in vpliv metode ESDA na daktiloskopske preiskave : diplomsko delo univerzitetnega študija
Authors:ID Anderlič, Maja (Author)
ID Drobnič, Katja (Mentor) More about this mentor... New window
Files:.pdf UNI_Anderlic_Maja_2012.pdf (1,76 MB)
MD5: BBE40E1030782FB609558E2D121742D1
PID: 20.500.12556/dkum/259259c0-be20-4446-83a7-da9219bc468f
 
Language:Slovenian
Work type:Bachelor thesis/paper
Typology:2.11 - Undergraduate Thesis
Organization:FVV - Faculty of Criminal Justice and Security
Abstract:Večina sledi, ki jih forenzični strokovnjaki (izvedenci) najdejo pri preiskovanju varnostno zanimivih pisanj na papirni podlagi, so običajno zelo slabo vidne ali celo nevidne s prostim očesom. Za njihovo odkritje se v prvi vrsti uporablja svetlobne vire, kot je videospektralni primerjalnik, ki se uporablja pri preiskavah ponarejenih dokumentov, in metode elektrostatskega izzivanja latentnega besedila, za katere je značilno, da so nedestruktivne narave. V nadaljevanju pa se za odkritje prstnih sledi uporablja še preiskave destruktivne narave, kot so kemijski postopki izzivanja prstnih sledi z reagentoma ninhidrin in DFO. Vendar pa so pri varnostno zanimivih pisanjih lahko prisotne tudi biološke sledi sline, ki se jih ne preiskuje s temi metodami. Z vidika zagotavljanja integritete dokaza, to je preprečevanja njihove izgube ali uničenja, pa je izredno pomembno, da se preveri, ali prve metode, ki se običajno uporabljajo pri preiskavah teh materialov, omogočajo zaznavo tudi drugih sledi in ali lahko negativno vplivajo na nadaljnje preiskovanje. Vrstni red preiskav mora zato izhajati iz načel in potreb posameznih forenzičnih področij. V okviru diplomskega dela smo izvedli eksperiment, ki je potekal na Oddelku za preiskavo dokumentov in na Oddelku za daktiloskopijo v Nacionalnem forenzičnem laboratoriju v Ljubljani. Eksperiment smo razdelili na dva dela, in sicer se je prvi del eksperimenta nanašal na preverjanje detekcije bioloških in daktiloskopskih sledi s tistimi optičnimi metodami, ki se uporabljajo pri preiskavi varnostno zanimivih pisanj. Drugi del eksperimenta pa je bil zasnovan tako, da smo z napravo ESDA najprej opravili elektrostatsko izzivanje latentnega besedila, zatem pa smo na prvi seriji vzorcev prstne sledi poskušali izzvati z ninhidrinom, na drugi seriji pa z DFO. Ugotavljali smo, ali ESDA vpliva na uspešnost daktiloskopskih metod. Hkrati smo preverjali, ali je mogoče med izzivanjem latentnega besedila z metodo ESDA zaznati tudi prisotnost bioloških sledi sline. S pomočjo eksperimenta smo ugotovili, da z nobeno od uporabljenih optičnih metod (videospektralni primerjalnik in forenzični svetlobni vir) nismo zaznali prstnih sledi, temveč samo sledi sline oziroma tekočin. Prav tako smo ugotovili, da uporaba metode ESDA ne vpliva na uspešnost izzivanja prstnih sledi, če za izzivanje uporabimo reagenta DFO in ninhidrin. Hkrati smo ugotovili, da z metodo ESDA zaznamo spremembe na papirju, ki jih povzročijo kapljice tekočine, med drugimi tudi slina. Te sledi lahko v nadaljevanju analiziramo še na prisotnost DNK.
Keywords:anonimna pisma, kriminalistično preiskovanje, forenzika, sledi, biološke sledi, prstne sledi, daktiloskopija, primeri, diplomske naloge
Place of publishing:[Ljubljana
Publisher:M. Anderlič]
Year of publishing:2012
PID:20.500.12556/DKUM-37118 New window
UDC:343.98
COBISS.SI-ID:2456810 New window
NUK URN:URN:SI:UM:DK:5GCA2RN7
Publication date in DKUM:09.10.2012
Views:2530
Downloads:250
Metadata:XML DC-XML DC-RDF
Categories:FVV
:
Copy citation
  
Average score:(0 votes)
Your score:Voting is allowed only for logged in users.
Share:Bookmark and Share


Hover the mouse pointer over a document title to show the abstract or click on the title to get all document metadata.

Secondary language

Language:English
Title:THE EFFECTIVENESS OF DETECTING BIOLOGICAL MATERIAL AND FINGERPRINTS USING LIGHT SOURCES IN THE EXAMINATION OF ANONYMOUS WRITING, AND THE EFFECT OF ESDA METHOD ON FINGERPRINT DEVELOPMENT
Abstract:Most of the evidence that forensic specialists (experts) find, when examining anonymous writings on a paper surface, are difficult to see, or even impossible to see, with the naked eye. This kind of documents are first examined using light sources such as Video Spectral Comparators (VSC), and electrostatic document analysis apparatus (ESDA) to detect latent writings as these examination methods are non-destructive in nature. Later on, chemical methods using reagents such as ninhydrin and DFO, which are more destructive in nature, are used to detect fingerprints. However, biological evidence such as saliva may also be present on anonymous writings, and other examination methods are in use for this kind of evidence. In terms of ensuring the integrity of the evidence, that is in preventing its loss or destruction, it is extremely important to check whether the initial, commonly used examination methods, make it possible to detect other types of forensic evidence at a later stage, or whether they adversely affect further examination. Therefore, there needs to be a set order to the examination methods of the evidence based on the principles and needs of individual forensic fields. Within the framework of our thesis, we conducted an experiment at the Questioned Documents Section NAC/CNAC and the Fingerprint Section of the National Forensic Laboratory in Ljubljana. The experiment was divided into two parts: the first part of the experiment involved the detection of biological material and fingerprints using the optical methods used in the examination of questioned documents. The second part of the experiment was designed so that we first used an ESDA to detect latent writing, then we attempted to develop one set of fingerprints using ninhydrin, and a second set with DFO. We assessed whether the ESDA affected the outcome of fingerprint detection methods. We also assessed whether it was possible to detect the presence of saliva while using ESDA to detect latent writing. The results of our experiment were that we didn’t detect fingerprints, but only saliva stains or fluids, while following either of the optical investigation methods selected for examination (VSC and a Forensic Light Source). We also found that ESDA doesn’t have a negative effect on a subsequent fingerprint detection using the reagents DFO or ninhydrin. At the same time, we found that ESDA would detect changes in paper caused by drops of liquid, including saliva. These stains can be further examined for the presence of DNA.


Comments

Leave comment

You must log in to leave a comment.

Comments (0)
0 - 0 / 0
 
There are no comments!

Back
Logos of partners University of Maribor University of Ljubljana University of Primorska University of Nova Gorica