Question 1

A comparison sample is also called a control sample.

Accepted Answer

A comparison sample is used as a control group to compare the results of an experiment or study. Therefore, it is also called a control sample.

Question 2

When gathering control samples, 50 full lengths of hair should be cut from the head along with 24 hairs from the pubic region.

Accepted Answer

It is not necessary to collect hair from the pubic region for control samples as they do not provide any additional information about drug use compared to hair from the head. Therefore, only 50 full lengths of hair from the head should be cut for control samples.

Question 3

Human hairs can reveal an individual's race.

Accepted Answer

Human hairs can provide information about the ethnic or racial background of the person to whom they belong. The shape, thickness, and texture of hair can vary depending on the individual's genetics, and these traits can be indicative of their racial or ethnic group. For example, individuals of African descent tend to have thick, tightly coiled hair, while those of Asian descent tend to have straight, smooth hair.

Question 4

Scientific analysis can positively match a fiber strand to a garment.

Accepted Answer

Scientific analysis can identify the type of fiber and potentially match it to a batch or manufacturer, but it cannot definitively match a fiber strand to a specific garment due to the lack of unique identifiers.

Question 5

The two kinds of physical evidence are class evidence and individual evidence.

Accepted Answer

Class evidence refers to evidence that can be linked to a group or category of individuals, while individual evidence can be specific to a single person.

Question 6

Which statement is NOT part of Locard's theory of exchange:&#10;A) Traces of the victim and the scene will be carried away by the perpetrator.&#10;B) Traces of only the victim will be found at the scene.&#10;C) Traces of the perpetrator will be left at the scene.&#10;D) Traces of the perpetrator will remain on the victim, and the victim may leave traces of himself or herself on the perpetrator.

Accepted Answer

Locard's theory of exchange includes the concepts mentioned in statements A, C, and D, but statement B is not included, as it suggests that no traces of the perpetrator would be found at the scene.

Question 7

In addition to collecting a comparison sample, what addition samples should be collected?&#10;A) unique&#10;B) physical&#10;C) control&#10;D) microscopic

Accepted Answer

Control samples are necessary in addition to comparison samples to ensure that the analysis can differentiate between substances from the scene and those that might have been introduced from other sources. Control samples help in establishing a baseline for comparison.

Question 8

According to the text, human hairs can reveal&#10;A) color of hair&#10;B) blood type&#10;C) age&#10;D) all of the above

Accepted Answer

The answer of According to the text, human hairs can...

Question 9

When gathering control samples for the laboratory, how many hairs should you collect from the head and pubic area?&#10;A) 40 from the head and 25 from the pubic area&#10;B) 50 from the head and 30 from the pubic area&#10;C) 60 from the head and 24 from the pubic area&#10;D) 50 from the head and 24 from the pubic area

Accepted Answer

The recommended number of head hairs to collect for a control sample is 50, while the recommended number of pubic hairs to collect is 24. Therefore, option D (50 from the head and 24 from the pubic area) is the best choice as it follows these guidelines.

Question 10

The two broad groups of fibers are&#10;A) cotton and wildflower&#10;B) manmade and natural&#10;C) synthetic and cotton&#10;D) none of the above

Accepted Answer

The two broad groups of fibers are manmade and natural. Cotton is a type of natural fiber, but it is not the only natural fiber. Wildflower, on the other hand, is not a type of fiber at all. Synthetic fibers are a subcategory of manmade fibers, so C is not the best choice. D is incorrect as there are two clear groups of fibers.

Question 11

Generally, glass fragment examination yields what kind of characteristics?&#10;A) general&#10;B) class&#10;C) individual&#10;D) unique

Accepted Answer

The answer of Generally, glass fragment examination yields what kind...

Question 12

Determining the direction and force of an impact on window glass can be accomplished by examining the _________ surrounding the hole.&#10;A) diameter&#10;B) thickness of the glass&#10;C) fracture patterns&#10;D) extent of breakage

Accepted Answer

The answer of Determining the direction and force of an...

Question 13

A pattern that encircles the hole or point of impact would be a _________ pattern.&#10;A) concentric&#10;B) radial&#10;C) whorl&#10;D) unique

Accepted Answer

The answer of A pattern that encircles the hole or...

Question 14

The agency that maintains a database that contains the density and refractive indices and elemental analyses for glass is the&#10;A) ATF&#10;B) Federal Bureau of Investigation&#10;C) Association of Professional Glaziers&#10;D) Product Safety Commission

Accepted Answer

The answer of The agency that maintains a database that...

Deck 5: Trace and Impression Evidence