Blood-Spatter Patterns

Blood can create patterns because:

• it is a liquid and follows the laws of physics.

• it is a solid and does not move.

• it evaporates quickly.

• it changes color when exposed to air.

When a person is injured and bleeding, what is the body's immediate response?

• The blood clots to stop the bleeding.

• The heart rate decreases.

• The body temperature rises.

• The person immediately faints.

Tags

NGSS.HS-LS1-3

The effect of gravity on blood when it falls is:

• It causes blood to fall faster.

• It has no effect on blood.

• It causes blood to fall slower.

• It causes blood to fall at a constant speed.

Tags

NGSS.MS-PS2-4

How do you indicate/determine the lines of convergence? Draw a line through the center of the blood away from the 'tail'; repeat for every drop.

Location of blood source can be determined if there are at least ________.

• at least two blood sources

• at least one witness

• at least three suspects

• at least one camera footage

What are the categories of blood-spatter patterns?

• Passive, Transfer, and Projected

• Solid, Liquid, and Gas

• Primary, Secondary, and Tertiary

• Direct, Indirect, and Diffuse

Cast-off stains are made when blood is ________.

• projected or thrown
• collected in a container
• washed away with water
• absorbed by a surface

Tags

NGSS.MS-PS2-1

During a forensic investigation, David noticed that shadowing/ghosting occurs when something ________ blood spatter.

• blocks.

• reflects.

• absorbs.

• enhances.

Tags

NGSS.MS-PS4-2

During a science experiment, Jackson observed that expiratory blood is often ________ instead of red.

• pink.

• blue.

• green.

• yellow.

Tags

NGSS.HS-LS2-5

List 5 procedures for packaging and processing blood evidence.

• 1. Allow blood to dry before packaging 2. Package in paper not in plastic 3. Take samples from all blood spatters 4. Perform field tests (Luminol) 5. Perform lab tests (ELISA, typing, DNA, etc.)

• 1. Use plastic bags for storage 2. Mix samples from different locations 3. Ignore drying process 4. Skip field tests 5. Avoid lab tests

• 1. Allow blood to dry before packaging 2. Use airtight containers 3. Take samples from one blood spatter only 4. Perform field tests (Luminol) 5. Perform lab tests (ELISA, typing, DNA, etc.)

• 1. Allow blood to dry before packaging 2. Package in paper not in plastic 3. Take samples from all blood spatters 4. Skip field tests 5. Perform lab tests (ELISA, typing, DNA, etc.)