Blood Spatter Analysis

1. Evidence

1.1. Light source

1.1.1. high intensity light

1.1.1.1. LCV Leuko Crystal Violet

1.1.2. UV lights

1.1.2.1. Fluorescein

1.1.2.2. Luminal

2. Stages of impact

2.1. Stage 1 - contact & collapse

2.2. Stage 2 - Displacement

2.3. Stage 3 - Dispersion

2.4. Stage 4 - Retraction

3. Types of blood stain patterns

3.1. Passive

3.1.1. Drops created or formed by the force of gravity

3.1.1.1. Drips

3.1.1.2. Drops

3.1.1.3. Pools

3.2. Projected

3.2.1. When energy has been transferred to the blood source

3.2.1.1. Velocity

3.3. Transfer

3.3.1. When blood comes in contact with a secondary surface

4. Blood Reagent Tests

4.1. Phenolphthalein

4.2. HemaStix

5. BloodStain Patterns

5.1. spatter is from application of force

5.2. Origin/source is the place the blood came from

5.3. Angle of impact is how the blood strikes the surface

5.4. Bloodstains

5.4.1. Parent drop - droplet from which a satellite originates

5.4.2. Satellite Spatters - drops that break off from the parent

5.4.3. Spines - pointed edges radiating out

6. Importance

6.1. Can be used to prove a case

6.2. Can reconstruct a crime

6.3. Can tell the how of a crime