ACTAR Evidence Collection 2

Question 1

When collecting tire mark evidence at a crash scene, what is the primary reason for measuring the WIDTH of a yaw mark?

Accepted Answer

To determine which axle produced the mark

Answer

The width of a yaw mark corresponds to the tire tread width, which helps identify whether it was produced by a front or rear axle.

Question 2

Which photographic technique is most effective for capturing the texture and depth of gouge marks in asphalt?

Accepted Answer

Oblique lighting (raking light) photography

Answer

Oblique or raking light cast at a low angle accentuates surface irregularities, making gouge depth and texture visible in photographs.

Question 3

A reconstructionist discovers fluid stains at a crash scene. What is the FIRST step before collecting a fluid sample for laboratory analysis?

Accepted Answer

Photograph and document the location and dimensions of the stain

Answer

Documentation of the stain's position, size, and relationship to other evidence must occur before any collection that disturbs the scene.

Question 4

Under the Federal Rules of Evidence, physical evidence from a crash scene must be accompanied by a proper chain of custody to ensure:

Accepted Answer

The evidence is admissible and has not been altered or tampered with

Answer

Chain of custody documentation establishes that evidence integrity was maintained from collection through courtroom presentation.

Question 5

When documenting airbag deployment evidence, which component provides the most reliable indication of occupant contact during a crash?

Accepted Answer

Fabric transfer and biological material on the airbag surface

Answer

Fabric transfer, blood, or skin cells on the airbag surface directly indicates occupant contact and body position at deployment.

(ACTAR) Accreditation Commission for Traffic Accident Reconstructionist Practice Test