CSI Forensic Analysis Techniques 3

Question 1

In bloodstain pattern analysis, what does a 'void pattern' indicate?

Accepted Answer

An object blocked blood from reaching a surface

Answer

A void pattern is an absence of bloodstain in an otherwise continuous pattern, indicating an object or person was present and blocked the blood.

Question 2

Which reagent is commonly used to enhance latent fingerprints on porous surfaces such as paper?

Accepted Answer

Ninhydrin

Answer

Ninhydrin reacts with amino acids in sweat residue on porous surfaces, producing a purple-colored compound called Ruhemann's purple.

Question 3

What does the term 'skeletonization' refer to in the context of decomposition and forensic entomology?

Accepted Answer

Complete removal of soft tissue leaving only bone

Answer

Skeletonization refers to the complete removal of soft tissue from a body, exposing the skeletal remains.

Question 4

In forensic serology, what is the ABO blood typing system used to determine?

Accepted Answer

Antigens present on red blood cell surfaces

Answer

ABO blood typing identifies specific antigens (A, B, both, or neither) present on the surface of red blood cells.

Question 5

Which technique is used to determine the elemental composition of a glass fragment?

Accepted Answer

Energy-dispersive X-ray spectroscopy (EDS)

Answer

EDS analyzes X-rays emitted from a sample when excited by an electron beam, revealing its elemental composition.

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