How is glass collected at a crime scene?
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.
What are the steps in handling glass evidence?
Terms in this set (6)
- Identify and photograph any glass samples before moving them.
- Collect largest fragments that can be reasonably collected.
- Identify outside and inside surface of any glass.
- If multiple panes are involved, make a diagram.
- Note trace evidence: skin, hair, blood, or fibers.
How is evidence handled at a crime scene?
They take photographs and physical measurements of the scene, identify and collect forensic evidence, and maintain the proper chain of custody of that evidence. Crime scene investigators collect evidence such as fingerprints, footprints, tire tracks, blood and other body fluids, hairs, fibers and fire debris.
How can glass fragments help in the crime scene investigation?
Glass fragments at a crime scene should always be collected and analyzed because several clues can be gathered about the events that occurred during the crime. Also, glass fragments can help police determine which direction the first bullet was fired through the glass.
Is glass trace or physical evidence?
Glass – Glass can be used to gather evidence, for example collecting fingerprints or blood from a broken window; however, glass also has a place in the trace evidence section. Broken glass fragments can be very small and lodge in shoes, clothing, hair or skin.
How important is a glass as a piece of evidence?
Broken or shattered glass found at a crime scene is an important piece of forensic evidence. When glass is shattered by a forceful impact, it scatters for distances up to nine feet or so, and can easily become lodged in a suspect’s shoes, clothing, or hair. …
What type of evidence is glass evidence considered?
trace evidence
What is the most important constituent of glass?
Silica: It is the principal constituent of glass. ADVERTISEMENTS: If silica alone is used in the manufacture of glass, it could be fused only at a very high temperature but it would give a good glass on cooling.
What are the 6 types of glass?
6 popular types of glass and their uses explained
- Float glass. Float glass is made using a ‘floating technique’ to create a uniform thickness and superior even appearance.
- Toughened glass.
- Painted glass.
- Patterned glass.
- Solar control glass.
- Laminated glass.
What are the 3 types of glass?
soda-lime glass, lead glass and borosilicate glass. These three types of glass make up around 95 percent of the cullet glass used in the production process.
What is the cheapest type of glass?
Soda-lime glass
What are the five uses of glass?
Glass is used in the following non-exhaustive list of products:
- Packaging (jars for food, bottles for drinks, flacon for cosmetics and pharmaceuticals)
- Tableware (drinking glasses, plate, cups, bowls)
- Housing and buildings (windows, facades, conservatory, insulation, reinforcement structures)
What are the two types of glass?
There are four main types or strengths of glass:
- Annealed Glass. Annealed glass is a basic product formed from the annealing stage of the float process.
- Heat Strengthened Glass. Heat Strengthened Glass is semi tempered or semi toughened glass.
- Tempered or Toughened Glass.
- Laminated Glass.