Question

Upon examining a crime scene you don't locate any visible prints. To identify latent prints you will have to use a powder. There is evidence to suggest that the suspect exited the crime scene through a door, the door frame is dark brown and the surrounding wall is dark green. What powder should you use

A) magnetic
B) titanium
C) aluminum
D) fluorescent

A forensic investigation involves the determination of manner, cause and mechanism of death. Select the choice that represents an example of cause of death.
A) homicide
B) asphyxia
C) skull fracture
D) epidural hematoma

What two drug isolation techniques are used together to give a very specific identification on a molecular level.
A) Scott test and gas chromatography
B) gas chromatography and mass spectrometry
C) thin layer chromatography and Infrared spectrometry
D) Marquis test and HPLC (high pressure liquid chromatography)

Answer 1

Answer: First answer is D- Fluorescent.

Second Answer is B- Asphyxia

Third answer is C- Thin layer chromatography and Infra Spectrometry.

Explanation:

Fluorescent powders for forensic use are developed to be used with a variety of light sources especially ultraviolet lights and are used to extract latent prints from dark surfaces and multicoloured surfaces where the prints and the surfaces and indistinguishable. They are also good for extracting latent prints from wooden surfaces. When applied, the hues of the fluorescent powder can be matched to the colour of the surfaces and the wavelength of the light source will be used. This way, it eliminates any background interference that may occur from the surface colour during extraction of latent print.

In forensic investigation, a cause of death means the injury or disease that lead to death. Asphyxiation is a condition where the body experiences insufficient supply of oxygen to continue its normal function. Common causes of asphyxia are choking, suffocation, drowning and strangulation. In general, for asphyxiation to occur, something physical is blocking the airways or lungs from receiving sufficient oxygen.

Thin layer chromatography is an economical and efficient technique used in separating mixtures of solids and liquids that are non-volatile in nature. It is used to separate compounds in a mixture. Infra red spectrometry is the interaction of infrared radiation with matter. It is used to study chemical substances of solid, liquid and gas. Thin layer chromatography and infra red spectrometry are good complements which are useful in analytical and research laboratories for analyzing molecules and different compounds especially for diverse complex researches.

Answer 2

1. The investigator should use fluorescent fingerprint powder, so that the prints will be visible on the dark surface when a special kind of light is used.

2. A possible cause of death would be asphyxia, and is one of the most common causes of death that involve murder and violence.

3. C. thin layer chromatography and Infrared spectrometry