Blood Evidence Study Guide

True or false: Brian has AB+ blood, so he is able to donate to someone with B- blood.

True or False: Blood spatter, or bloodstain pattern interpretation, is a technique that seeks to piece together the events that caused bleeding.

Which of the following drops were most likely dropped from a 90⁰ angle?

• the first one

• the second one

• the third one

• the last one

The following passive drops originated from 1 ft., 2 ft, and 3 ft. Which one of the drops most likely fell from 1 ft.?

• The largest one on the left

• The medium sized one in the middle

• The smallest one on the right

What is the arrow pointing to?

• Spine

• Spike

• Satellite

• Space

Investigators must use a method called stringing to find the ______________________.

• Area of convergence

• Point of origin

• Angle of impact

• Velocity and height

The fastest that free falling blood can travel is _____.

• 12.5 ft/sec

• 25 ft/sec

• 50 ft/sec

• 100 ft/sec

Blood stains can be classified by their _____________ upon impact.

• Size

• Shape

• Velocity

• None of the above

In the actual spatter analysis, a forensic investigator determines where the blood came from and how it spread over the surface. This is known as the blood's ______________.

• Type

• Trajectory

• Angle of impact

• Diameter

How would a forensic investigator categorize this blood stain?

• High velocity spatter

• Medium velocity spatter

• Low velocity spatter