CSI Latent Print Processing 2

Question 1

Which technique uses a vacuum chamber to deposit metal vapor onto a surface to develop latent prints?

Accepted Answer

Vacuum metal deposition (VMD)

Answer

Vacuum metal deposition deposits gold and zinc onto surfaces in a vacuum, making it highly sensitive for prints on plastics and polymers.

Question 2

What is the primary advantage of using alternate light sources (ALS) before applying chemical developers?

Accepted Answer

ALS can reveal prints without consuming or contaminating them

Answer

ALS is non-destructive, allowing prints to be detected and photographed before any chemical is applied that might alter them.

Question 3

When processing a wet porous surface such as a rain-soaked document, which reagent is most appropriate?

Accepted Answer

Physical Developer (PD)

Answer

Physical Developer works in an aqueous silver-based reaction and is effective on wet porous items because it reacts with inorganic components that resist washing.

Question 4

Which of the following fluorescent dyes is commonly used after cyanoacrylate fuming to enhance contrast on multi-colored surfaces?

Accepted Answer

Rhodamine 6G

Answer

Rhodamine 6G is a fluorescent dye that bonds to the polymerized cyanoacrylate, enabling visualization under laser or ALS illumination.

Question 5

Iodine fuming develops latent prints through which mechanism?

Accepted Answer

Physically absorbing into fatty residues

Answer

Iodine vapors are physically absorbed into the fatty (sebaceous) components of the print deposit, creating a temporary yellow-brown image.

(CSI) Crime Scene Investigator Practice Test

(CSI) Crime Scene Investigator Practice Test

CSI Latent Print Processing 2