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Definitions 7S’s of a Crime Scene Crime Scene Sketch Crime Scene Personel Blood Spatter 10 Point 10 Point 10 Point 10 Point 10 Point 20 Points 20 Points 20 Points 20 Points 20 Points 30 Points 30 Points 30 Points 30 Points 30 Points 40 Points 40 Points 40 Points 40 Points 40 Points 50 Points 50 Points 50 Points 50 Points 50 Points

What is Locard’s Exchange Principle?

When two surfaces come into contact, there will always be an exchange between the surfaces

What is trace evidence?

Physical evidence that is in small but measurable amounts.

What is an alibi?

Statement of where the suspect was during the time of the crime

What is Deductive Reasoning?

The process of using information that will remove a person from the suspect pool a.k.a process of elimination

What is the difference between a suspect and an accomplice?

A suspect is a person thought to be capable of committing the crime…an accomplice is someone who assisted the suspect in the crime

What is the first step in the 7S process?

Securing the Scene

What is the purpose of the second step: Separating Witnesses?

To compare accounts of the story

What is the last step in the 7S process?

Secure Evidence

What are the three methods scientists can search for evidence?

Spiral Grid Quadrant

What is the purpose of the third step of the 7S process?

To distinguish the primary scene from secondary scenes; to determine what needs to be photographed

What conventional units of measurement are used in Crime Scene Sketches? (name all 4)

Inches, Feet, Centimeters, Meters

What does a crime scene sketch assist with?

Interviewing and interrogating personnel; preparing an investigative report; presenting the case in court

What are the first two steps in sketching a crime scene?

Observe and Plan Make Measurements

What are three characteristics to the rough draft?

Includes as much detail as possible Drawn in pencil Not drawn to scale Includes as much detail as possible

Name the 7 pieces that belong in the legend.

Identifying Information (Key) Case Number Type of Crime Investigator Persons Assisting Direction of North Identifying Information (Key) Scale

This person’s job is to secure the scene so no evidence is destroyed

Police Officer

This person’s job is to determine if any search warrants are needed

District Attorney

This person determines the preliminary cause of death

Medical Examiner

This person is responsible for interviewing the witnesses

Detectives

This person is responsible for documenting the crime scene in detail

Crime Scene Investigators

What is another name for projected blood stain?

Blood Spatter

What is the shape of blood as it forms a drop?

Spherical

Why does increasing height also increase the diameter of the blood spatter?

Gravity causes the drop to accelerate to higher velocities

How does the surface tension of blood compare to water?

It is a little less than water

What are the 5 things blood spatter analysis can tell us about the crime?

1. Distance 2. Location 3. Speed 4. Direction 5. Movement

Final Jeopardy Make your wager

Name the 7S Steps in Order

1. Securing the Scene 2. Separating the Witnesses 3 1. Securing the Scene 2. Separating the Witnesses 3. Scanning the Scene 4. Seeing the Scene 5. Sketching the Scene 6. Searching for Evidence 7. Securing and Collecting Evidence