Glass as Evidence Pt. 1

What is glass evidence in forensic science?

• Glass bottles found in a park

• Fragments or shards of glass found at a crime scene

• recycled glass fragments

What are the different types of glass evidence that can be found at a crime scene involving cars or trucks?

• tempered glass, laminated glass

• safety glass, wire glass, bulletproof glass

• mirrored glass, frosted glass, etched glass

glass evidence should be ________________ before moving.

• pressure washed

• pictured or photographed

• heated up

What are the characteristics of tempered glass?

• shatters into small, pieces when broken

• likely to make long cracks

• shatters into large, dangerous pieces when broken.

How can the refractive index of glass be used as evidence?

• By observing the color of the glass

• By comparing glass found on a victim to a secondary location

• By analyzing the texture of the glass

• By measuring the weight of the glass

What is the significance of glass fracture patterns in forensic investigations?

• determining the order of shots fired through a store front window.

• Glass fracture patterns are only useful in civil cases, not criminal cases.

• Glass fracture patterns can only be used to determine the type of glass.

How can the density of glass be determined in a forensic analysis?

• By measuring its weight and volume and calculating the ratio of weight to volume.

• By analyzing its chemical composition and determining its density based on known values.

• By measuring its mass and volume and calculating the ratio of mass to volume.

• By observing its transparency and determining its density based on known values.

What is the role of glass evidence in hit-and-run cases?

• Glass evidence can only be used to determine the make and model of the vehicle involved.

• Glass evidence is only useful if there are witnesses to the incident.

• Glass evidence can match the vehicle to glass fragments found at the crime scene

Radial fractures

• forms an "S" shape from the point of impact

• cracks that form straight lines from the point of impact.

• cracks that radiate outward from the point of impact

Concentric fractures

• are circular lines around the point of impact;

  they begin on the same side as the force

• radiate out from the origin of the impact;

  they begin on the opposite side of the force

• are zig zag shaped around origin of impact;

  they begin from the opposite side of the force