Forensic Science Principles and Concepts

What is the core principle of the Law of Individuality in forensic science?

• All natural objects are identical.

• No two objects, whether natural or man-made, are exactly alike.

• Man-made objects can be perfectly duplicated.

• Objects only gain uniqueness through wear and tear.

Even when manufactured in the same machine, why are two man-made objects, like currency notes or footwear, not considered exactly alike according to the Law of Individuality?

• They are designed to be slightly different for security reasons.

• Manufacturing processes always introduce unique characteristics or flaws.

• They are made from different raw materials.

• Human error during production ensures uniqueness.

Which of the following is considered a prime example of the Law of Individuality in forensic science?

• Identical twins having the same DNA.

• Two leaves from the same plant.

• Unique patterns found in fingerprints.

• Mass-produced currency notes.

What fundamental concept does the Law of Progressive Change describe in forensic science?

• The constant improvement of forensic techniques.

• The natural decay and alteration of evidence over time.

• The evolution of criminal behavior.

• The increasing complexity of crime scenes.

Why is it crucial to secure a crime scene as soon as possible, according to the Law of Progressive Change?

• To prevent the public from witnessing the scene.

• To ensure evidence is not displaced or destroyed by external factors.

• To allow investigators more time to plan their approach.

• To minimize media attention on the case.

What is the central idea behind Locard's Law of Exchange?

• Criminals always return to the scene of the crime.

• Every interaction between two objects results in a transfer of material.

• Evidence can only be found at the crime scene.

• The more intense a crime, the more evidence is left behind.

When a person presses their finger on a surface, what exchange of material occurs according to Locard's Law of Exchange?

• The finger leaves a print, and the finger picks up some constituents from the surface.

• Only the finger leaves a print on the surface.

• Only the finger picks up material from the surface.

• No material exchange occurs unless the surface is wet.

The Forensic Linkage Triangle illustrates the relationship between which three elements in a crime investigation?

• Police, witnesses, and evidence.

• Victim, criminal, and crime scene.

• Motive, opportunity, and means.

• Fingerprints, DNA, and eyewitness accounts.

What fundamental principle of forensic science states that a criminal always leaves something behind at a crime scene and takes something away from it?

• Law of Individuality

• Locard's Law of Exchange

• Principle of Comparison

• Law of Progressive Change

In the 1912 Marie Latelle case, what type of evidence found on Emile Gourbin helped establish his presence at the crime scene and link him to the victim?

• Footprints and weapon residue

• Hair samples and clothing fibers

• Skin samples and cosmetic dust

• Blood stains and broken glass