BIOMED Q1)

Locard’s Exchange Principle

States ‘When a person comes into contact with another person, thing, or place, they exchange physical evidence’

Trace Evidence

Tiny Fragments of physical evidence (ex: hair, clothing fibers)

Hair Evidence

A type of trace evidence that can provide information about a person’s age, race, and even gender. This can not 100% connect to a person, but it can rule out potential suspects.

Parts of the Hair

Cuticle (outermost layer), Cortex (middle/intermediate layer), and medulla (innermost layer)

What can Hair follicles reveal?

→ Hair follicles can show how damaged the hair is, revealing if the hair has underwent treatments (ex. perming/keratin, hair dye)

→ Hair follicles can reveal specific medical conditions

→ Hair follicles can reveal hair color

Fingerprints Rule

No two people (even identical twins) have the SAME EXACT fingerprint

Fingerprint Makeup

A fingerprint is made up of concentric patterns known as ridges (arches, loops, and whorls)

What kind is this?

Plain Arch

What kind is this?

Tent Arch

What kind is this?

Radial (points to thumb)/Ulnar (points to pinky)

What kind is this?

Whorl Print

Minutiae

Tiny ridge details a part of fingerprints

Most/Least frequent Minutiae

Most- Ridge ending,

Least- Triple Fork

What kind of minutaie?

Fork

What kind of minutiae?

Eye

What kind of minutiae?

Dot/Island