CFC Bloodstain Pattern Analysis 4

Question 1

Which factor does NOT directly affect the size of a blood droplet in free fall?

Accepted Answer

Ambient humidity

Answer

Ambient humidity does not directly affect droplet size during free fall; surface tension and viscosity are the primary physical properties that determine blood droplet size.

Question 2

A curved cast-off pattern on a wall most directly indicates:

Accepted Answer

A bloody object was swung in an arc, releasing blood during the backswing or follow-through

Answer

Cast-off patterns result from blood being flung from a moving bloody object (such as a weapon being swung), and the arc shape reflects the path of that swing.

Question 3

In BPA, what is the significance of multiple parallel cast-off stripes on a ceiling?

Accepted Answer

They indicate the weapon was swung multiple times, with each stripe representing one swing

Answer

Each arc stripe in a cast-off pattern on a ceiling typically represents a separate swing of the bloody object, allowing analysts to estimate the minimum number of blows.

Question 4

Which type of transfer stain would be most useful in identifying a specific tool or object used at a crime scene?

Accepted Answer

Pattern transfer (contact stain)

Answer

A pattern transfer or contact stain preserves the shape of the object that created it, potentially matching a specific tool, hand, shoe, or fabric pattern.

Question 5

When blood drops fall from a greater height onto a horizontal surface, the resulting stain will:

Accepted Answer

Be larger with more pronounced scalloping and satellite spatter

Answer

Greater fall height increases droplet velocity, producing a larger stain upon impact with more pronounced scalloping and satellite spatter due to higher kinetic energy.

(CFC) Certified Forensic Consultant Practice Test

(CFC) Certified Forensic Consultant Practice Test

CFC Bloodstain Pattern Analysis 4