Unit 3-Physical Evidence

Tangible objects, including weapons, and trace evidence. Real direct evidence to the crime.

Any type of written or recorded evidence.

Evidence that is used to help recreate a crime (for a trial)

Evidence given by witness during a trial.

The process of determining the chemical/physical characteristics of a piece of evidence with as much certainty as possible.

The process of testing a suspect sample with a known sample to prove whether or not they share a common origin.

The frequency of an event. How likely it is that 2 sources would share the same characteristics.

Reliable, Sensitive, and Specific.

Properties associated with a common source to a high degree of certainty.

The ridge endings, enclosures, and other details that make up a fingerprint.

Can only be associated with a group and not a single source.

Described a substance/object without referring to another substance (weight,volume,size,colour)

Describes what happens when a substance reacts with another substance.

Density and refractive index. Will vary in a single sheet of glass.

Fractures that extend out words like spokes on a wheel.

Fractures that form a circle around the point of impact.

Radial Fracture, then concentric fracture.

A surface material from the earth.

Within a 100-yard radius of the crime scene in various locations, only take surface materials, about 1-2 tablespoons.

They’re preserved so that any dirt that falls off is retained.

Plaster of Paris, crumbled too easily

An electrostatic dust print lifter.

Clear tape to lift it.

Yes!!!