Forensic Analysis Principles and Concepts

The video tutorial covers the seven principles of forensic science, including Locard's Principle of Exchange, the Law of Progressive Change, the Principle of Comparison, the Law of Individuality, the Principle of Analysis, the Law of Probability, and the Law of Circumstantial Fact. Each principle is explained with examples, highlighting their importance in forensic investigations. The tutorial emphasizes the uniqueness of evidence, the necessity of proper sampling, and the role of probability in narrowing down suspects.

What does Locard's Principle of Exchange imply in forensic science?

• Objects remain unchanged over time.

• Only similar items can be compared.

• All objects are unique.

• Every contact leaves a trace.

Who is credited with formulating the Principle of Exchange?

• Sherlock Holmes

• Edmund Locard

• Edmund Lockhart

• Ed Burn

What does the Law of Progressive Change state?

• Only similar items can be compared.

• Everything changes with time.

• Objects remain unchanged over time.

• All objects are unique.

Why is it important to preserve biological samples properly?

• They remain unchanged over time.

• They do not leave traces.

• They are always unique.

• They can degrade quickly if not preserved.

According to the Principle of Comparison, what can be compared?

• Any two objects

• Only similar items

• Objects that are unique

• Objects with different characteristics

What is an example of the Principle of Comparison?

• Comparing a blood sample with a saliva sample

• Comparing tool marks with bite marks

• Comparing a blood sample with another blood sample

• Comparing handwriting on paper with handwriting on a wall

What does the Law of Individuality state?

• All objects are identical.

• Every object is unique.

• Objects can be duplicated.

• Objects remain unchanged over time.

Why is correct sampling crucial in forensic analysis?

• To compare different types of samples

• To ensure objects remain unchanged

• To prevent contamination and degradation

• To duplicate the sample

How does the Law of Probability assist in criminal investigations?

• By ensuring all objects are unique

• By comparing different types of evidence

• By determining the likelihood of events

• By preventing changes over time

What does the Law of Circumstantial Fact emphasize?

• Facts do not lie, but people can.

• Facts can lie, but people cannot.

• Probability is irrelevant in investigations.

• All evidence is circumstantial.