Forensic glass analysis involves comparison of glass fragments found at crime scenes or other locations to determine if they have a common origin.
What is glass evidence?
If a window or glass object is broken or shattered by a projectile, such as a bullet, the breakage pattern can be analyzed to possibly determine the angle of trajectory of the projectile, shedding more light on the crime, such as where the suspect was when the gun was fired. ...Feb 13, 2018
What are the 4 types of forensic analysis?
- Chromatography, spectroscopy, hair and fiber analysis, and serology (such as DNA examination)
- Pathology, anthropology, odontology, toxicology, structural engineering, and examination of questionable documents.
What is the importance of glass in criminal investigation?
Fragments of glass from headlights at a hit-and-run scene can leave clues about the unknown vehicle. Also, glass fragments can help police determine which direction the first bullet was fired through the glass.
What are the 4 steps of the forensic process?
The guide recommends a four-step process for digital forensics: (1) identify, acquire and protect data related to a specific event; (2) process the collected data and extract relevant pieces of information from it; (3) analyze the extracted data to derive additional useful information; and (4) report the results of the ...Sep 14, 2006
What is an example of forensic analysis?
A suspect's fingerprint, blood, or semen at the scene of a robbery, murder, or rape strongly links the suspect to the crime scene. ... For example, if a particular shoe impression or an identical fingerprint is found at two or more scenes, this evidence may link the scenes to a single suspect.
How is forensic glass collected?
COLLECTION PROCEDURE: The glass should be placed in a sealed paper bindle or a folded and sealed paper or plastic bag, depending on size. Large pieces of glass with sharp edges should be put into sealed containers (such as cardboard boxes) in which they will not cut their way through.
How are glass fragments collected from a crime scene?
Collection: Trace examiners may use magnification and light to find glass fragments on clothing, an individual or at a crime scene and extract those using tweezers. Tape may also be used to collect glass samples, but the residue left from the adhesive makes this a less desirable collection method.
How do forensics test glass?
Forensic glass samples can be analyzed by comparing the refractive index of the sample to that of the possible source. Examination of samples under a regular microscope or a scanning electron microscope can give detailed information about the sample's physical and chemical characteristics.Feb 13, 2018
How should glass evidence be collected processed and handled in a crime scene investigation?
Glass can be said that it has the same characteristics as glass found in the possession of a suspect. Smaller glass fragments should be placed in a paper packet and then in an envelope. Larger pieces should be wrapped securely in paper or cardboard and then placed in a padded cardboard box to prevent further breakage.
What are two most often used methods of glass analysis?
The projects focus on the two elemental analysis techniques X-Ray Fluorescence (XRF) and Laser Ablation Inductively Coupled Mass Spectrometry (LA-ICP-MS) that are commonly used by forensic glass analysts.Jul 17, 2020
What are the two most important properties used to analyze a piece of glass?
To compare glass fragments, a forensic scientist evaluates two important physical properties: density and refractive index.