CFL Tool Mark Analysis 3

Question 1

In the context of forced entry, 'compression marks' on a lock face are most indicative of:

Accepted Answer

Impact or prying force applied perpendicular to the surface

Answer

Compression marks result from direct force pressing into the surface, such as a hammer blow or pry bar tip applied perpendicularly.

Question 2

Which standard provides guidelines for the documentation and reporting of tool mark examinations in the United States?

Accepted Answer

SWGMAT tool mark examination guidelines

Answer

SWGMAT (Scientific Working Group for Materials Analysis) developed the forensic guidelines specifically for tool mark examination.

Question 3

A dimple or raised burr on the shank of a picked lock pin is most likely caused by:

Accepted Answer

The pick tool applying lateral pressure and scratching the pin surface

Answer

During picking, the pick tool contacts and applies lateral pressure to pins, leaving striae or burrs on their surfaces.

Question 4

When photographing tool marks for forensic documentation, oblique lighting is preferred because it:

Accepted Answer

Enhances depth and texture by casting shadows across surface features

Answer

Oblique (raking) light strikes the surface at a low angle, casting shadows that reveal the topography of striae and impressed marks.

Question 5

A forensic locksmith examining a padlock shackle cut with bolt cutters would expect to find:

Accepted Answer

Striated marks on the shear faces corresponding to the blade edges of the cutters

Answer

Bolt cutters leave striated shear marks on the cut surface that reflect the blade geometry and surface imperfections of the tool.

(CFL) Certified Forensic Locksmith Practice Test