Trace Evidence

Question 1

What is an intensive property of matter

Answer 1

A property that does not change, depending on size and shape

Question 2

______ _____ is the ratio of the velocity of light in a vacuum to that in the medium under examination.

Answer 2

Refractive index

Question 3

_______ glass is stronger than normal glass due to rapid heating and cooling.

Answer 3

Tempered

Question 4

________ glass found in car windshields has a layer of plastic between two pieces of ordinary window glass.

Answer 4

Laminated

Question 5

Explain the flotation method of determining the density of trace evidence

Answer 5

The density of the liquid is carefully adjusted by the addition of small amounts of an appropriate liquid until the glass chip remains suspended in the liquid medium.

Question 6

The penetration of window glass by a projectile, whether it is a bullet or a stone, (______ fractures) and encircle the hole (______ fractures).

Answer 6

radial, concentric

Question 7

A high-velocity projectile, such as a bullet, often leaves a hole that is wider at the _____ side

Answer 7

exit

Question 8

The direction of impact can also be accomplished by applying the ________

Answer 8

3R Rule

Question 9

What is the 3R rule

Answer 9

Radial cracks form a Right angle on the Reverse side of the force.

Question 10

Glass fragments should be packaged in…

Answer 10

containers to avoid further breakage.

Question 11

If the suspect’s shoes and/or clothing are to be examined for the presence of glass fragments…

Answer 11

they should be individually wrapped in paper and transmitted to the laboratory.

Question 12

Nevertheless, paints can only be individualized if they have a sufficiently complex ______ _______

Answer 12

Layer Structure

Question 13

_______ ________ ____________ and __________ _______________ are invaluable techniques for distinguishing most paint binder formulations, adding further significance to a forensic paint comparison.

Answer 13

Pyrolysis gas chromatography and infrared spectrophotometry

Question 14

When a transfer of paint occurs in hit-and-run situations, __________ ________ ______ must always be collected from _ _________ ______ of the car

Answer 14

uncontaminated reference paint; an undamaged area of

Question 15

The value of _____ as evidence rests with its prevalence at crime scenes and its transferability between the scene and the criminal.

Answer 15

Soil

Question 16

Standard/reference soils are to be collected at various intervals within a _____________ of the crime scene, as well as the site of the crime, for comparison to the questioned soil.

Answer 16

100 foot radius