CSI Latent Print Processing 3

Question 1

Which powder is recommended for developing latent prints on dark-colored surfaces?

Accepted Answer

White aluminum powder

Answer

White or light-colored powders provide contrast on dark surfaces because the light powder stands out against the dark background.

Question 2

Small particle reagent (SPR) is used on which type of surface?

Accepted Answer

Wet non-porous surfaces

Answer

SPR is a suspension of molybdenum disulfide that adheres to fatty residues and is designed for wet or submerged non-porous surfaces.

Question 3

1,8-Diazafluoren-9-one (DFO) primarily reacts with which component of latent print residue?

Accepted Answer

Amino acids

Answer

DFO is an amino-acid-reactive reagent that fluoresces under green light excitation, making it useful on porous surfaces before ninhydrin.

Question 4

Which statement best describes the 'sequential processing' strategy for latent prints?

Accepted Answer

Use the least destructive to most destructive methods in order

Answer

Sequential processing moves from non-destructive techniques (ALS, photography) through progressively more destructive chemical methods to preserve evidence integrity.

Question 5

What type of light filter should a photographer use when capturing fluorescent latent prints under ALS?

Accepted Answer

Barrier (long-pass) filter that blocks the excitation wavelength

Answer

A barrier filter removes the excitation light while passing the longer-wavelength fluorescence emitted by the print, improving contrast in the image.

(CSI) Crime Scene Investigator Practice Test

(CSI) Crime Scene Investigator Practice Test

CSI Latent Print Processing 3