Unit 2: Impression Evidences - Practice Quiz

1 What is an impression evidence?

2 Impressions that are visible to the naked eye are called:

3 A three-dimensional impression left in a soft surface such as mud or snow is known as a:

4 Which type of impression is not visible without enhancement techniques?

5 Which material is most commonly used to cast a three-dimensional footwear impression in soil?

6 Before casting a footwear impression, the investigator should first:

7 Why is a scale placed next to an impression before photographing it?

8 Tyre impressions are especially useful for linking which of the following to a crime scene?

9 A cast made from an impression produces a replica that is:

10 The scientific study of lip prints is known as:

11 Lip prints are considered valuable in forensics because they are:

12 Lip prints are most commonly found at a crime scene on which of the following?

13 The grooves and furrows present on the lips are technically referred to as:

14 The forensic analysis of bite marks falls under which discipline?

15 Bite mark comparison typically involves matching the mark to a suspect's:

16 On which of the following are bite marks most commonly found in violent crimes?

17 A suspect's dental model used for bite mark comparison is usually made from:

18 A toolmark is best defined as:

19 Which of the following is a common example of a toolmark at a crime scene?

20 Striated toolmarks are typically produced by which type of action?

21 A crime scene investigator finds a three-dimensional impression left in soft mud near a broken window. Which category of impression evidence does this best represent?

22 An investigator uses oblique (side) lighting at a shallow angle across a dusty floor. This technique is most useful for locating which type of impression?

23 At a scene, a footwear mark is visible because the shoe transferred dust onto a clean tile. This is an example of which impression type?

24 Before pouring dental stone into a shoe impression left in fine sandy soil, which preparatory step best prevents the detail from being destroyed?

25 Which material has largely replaced plaster of Paris for casting footwear impressions because of its superior hardness and fine detail retention?

26 A dental stone mix uses roughly a ratio of powder to water. If an examiner needs about of dental stone powder, approximately how much water is required?

27 When casting an impression in snow, which product is commonly applied first to highlight and preserve detail before dental stone is poured?

28 Because a tyre's circumference is much larger than a single footprint, examiners recording a rolling tyre impression should capture a length equal to at least:

29 The scientific study and classification of lip print patterns is known as:

30 In the Suzuki and Tsuchihashi classification, a lip groove that runs completely (straight) across the lip from top to bottom is designated as:

31 Why is a latent lip print on a drinking glass often developed using lysochrome dyes such as Sudan Black?

32 Which statement about the forensic value of lip prints is most accurate?

33 During bite mark analysis, an examiner overlays a life-size transparent tracing of a suspect's dentition onto a photograph of the wound. This method is called:

34 Why must a scale (ABFO No. 2 ruler) be placed in the same plane as a bite mark before photographing it?

35 Before any physical measurement of a bite mark on skin, which evidence should be collected first to avoid destroying it?

36 A bite mark shows two opposing arches of contusions. Which arch is generally attributed to the maxillary teeth?

37 A pry bar forced into a door frame leaves a compressed depression without any sliding motion. This is classified as which type of toolmark?

38 A screwdriver dragged across a painted surface leaves a series of fine parallel lines. These striations are produced by:

39 When comparing a suspect tool to a questioned toolmark, why do examiners make test impressions in a soft material rather than comparing the tool directly to the evidence?

40 Which instrument is the standard choice for the side-by-side examination of striated toolmarks?

41 A crime scene investigator finds a two-dimensional impression on a smooth tile floor that is only visible when viewed at an oblique angle under a strong light source. There is no visible residue transfer. Which classification and recovery approach is MOST appropriate?

42 During examination, an investigator must distinguish between a three-dimensional impression and a two-dimensional impression. Which single criterion is the defining discriminator?

43 An impression in mud shows a shoe outline where the ridges of the shoe correspond to depressions in the mud. What type of impression is this, and how does it relate to the original object?

44 Which sequence correctly reflects the mandated order of operations when a three-dimensional footwear impression is discovered outdoors before rain threatens?

45 When casting a footwear impression in dry, loose sandy soil, a technician must stabilize the surface before applying dental stone. Which preparatory step is MOST critical to prevent detail loss?

46 A technician mixes dental stone using a water-to-powder ratio that is too high. What is the MOST likely consequence for the resulting cast?

47 For casting a footwear impression in snow, which combination of products/techniques is specifically indicated to improve contrast and prevent melting of fine detail?

48 A tyre impression spans a much longer distance than a single footwear impression. What is the primary examination reason for capturing at least one full circumference of tread in the recovered impressions?

49 After a dental stone cast has set, what is the recommended handling protocol before cleaning and comparison?

50 According to the Suzuki and Tsuchihashi classification of cheiloscopy, a lip groove that branches into a Y-shape is designated as which type?

51 A latent lip print is found on a drinking glass at a crime scene. Which visualization approach is MOST appropriate given lip prints often contain both sebaceous/lipid and aqueous components?

52 An examiner notes that lip prints of monozygotic twins show differences in groove patterns. What does this observation primarily support regarding cheiloscopy?

53 Which factor represents the MOST significant limitation when relying on lip print evidence for positive identification in court?

54 In bite mark analysis, an examiner must correct for distortion introduced when a curved skin surface is photographed and compared to a flat dental cast. Which type of distortion is this, and how is it primarily addressed?

55 When producing a hollow-volume overlay for bite mark comparison, what characteristic of the suspect's dentition does the overlay specifically represent?

56 Recent scientific critiques (e.g., NAS 2009 and PCAST 2016) challenged bite mark comparison primarily on which grounds?

57 An examiner must decide whether an injury is a human bite mark or an animal bite. Which feature MOST reliably indicates a human adult anterior bite pattern?

58 In toolmark examination, a striated mark left by a screwdriver dragged across a soft metal surface is compared to test marks. Why must test marks be made at multiple angles of attack?

59 Toolmarks are broadly divided into impressed (compression) and striated (friction) marks. Which scenario would produce a predominantly IMPRESSED toolmark?

60 When casting a toolmark inside a struck keyway or recessed area where the mark cannot be brought to the lab, which casting material is MOST appropriate and why?