What are the most important properties of glass used by forensic scientist?
To compare glass fragments, a forensic scientist evaluates two important physical properties: density and refractive index. Is a precise and rapid method for comparing glass densities. A glass particle is immersed in a liquid. The other pieces of glass will remain sink, or float.
How can glass analysis help solve a crime?
Comparing the color of a suspect piece of glass with the color of a reference sample can distinguish whether the two samples share a common source. As a consequence, significant color differences between glass fragments can be used as the basis for exclusion of a suspect.
Why is it important to collect all the glass from a scene?
All fragments of glass from a scene should be collected if the aim is to determine the angle or point of impact. The F.B.I recommends that small fragments be packaged in plastic vials such as a film canister.
What is glass analysis in forensic science?
Analysis. A forensic glass analysis is typically a comparison of two or more glass fragments in an attempt to determine if they originated from different sources. Less frequently, it is a question of determination of end use, or glass provenance.
How can the glass evidence help the investigator locate the vehicle that fled the scene?
How can the glass evidence help the investigator locate the vehicle that fled the scene? The right side of the figure below depicts stress marks on the edge of a glass fracture caused by the application of force. … If this is a radical fracture the force came from the right. if it is concentric it came from the left.
How Can glass be used in forensics?
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.
What is the significance of glass and glass fragments in criminal investigations?
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. These clues can be gathered through the analysis of even the smallest fragments of glass.
What is tempered glass forensics?
Glass that has been subjected to extreme temperatures or chemical treatments to improve its strength is called tempered glass, or safety glass. Tempered glass is stronger than normal glass due to rapid heating and cooling.
How is glass class evidence?
Glass can be found as individual characteristic in cases where significant fitting of two glass fragments. … It is class evidence most of the time because without two fitting glass fragments, the glass can be identified but not linked to a specific object.
How is forensic science important in criminal investigation as well as the solution of crime?
The types of evidence and where it is found can assist investigators to develop a sense of how the crime was committed. … In addition, the application of forensic examination and analysis could turn any of these exhibits into a potential means of solving the crime.
How has forensic science helped solve crimes?
Forensic science is a critical element of the criminal justice system. Forensic scientists examine and analyze evidence from crime scenes and elsewhere to develop objective findings that can assist in the investigation and prosecution of perpetrators of crime or absolve an innocent person from suspicion.