Exam 4: Crime Scene Reconstruction: Blood Stain Pattern Analysis

Cast-off patterns can show the ________ number of blows.

Drops propelled from a blunt surface will be larger and the pattern will be:

Crime-scene ________ is the method used to support a likely sequence of events at a crime scene by observing and evaluating physical evidence and statements made by individuals involved with the incident.

Crime-scene reconstruction involves the efforts of all EXCEPT the:

If the distribution and pattern of bloodstains at a crime scene are not properly documented and analyzed, what potential information could be missed?

Widely spaced bloody shoeprints with satellite spatter between the shoeprints were likely deposited by an individual who was:

At the crime scene, the string method is used to find the ________ of an impact spatter pattern.

Match the word in Column 1 to its definition in Column 2. Each answer can only be used once. A)The process by which the edges of a stain will dry to the surface in a specific period of time (dependent upon environmental and surface conditions)and will remain apparent even after the rest of the bloodstain has been disturbed from its original position B)A bloodstain pattern formed by the movement of small or large amounts of blood due to gravity's pull C)A bloodstain pattern produced when an object makes forceful contact with a source of blood, projecting droplets of blood outward from the source D)Blood directed back towards the source of the force that caused the spatter E)An area within a deposited spatter pattern that is clear of spatter, caused by an object or person blocking the area at the time of the pattern's deposition F)Small droplets of blood that are distributed around the perimeter of a drop or pool of blood that were produced as a result of the blood impacting the target surface G)Blood which travels away from the source in the same direction as the force which caused the spatter H)The area on a two-dimensional plane where lines traced through the long axis of several individual bloodstains meet. This approximates the two-dimensional place where the bloodstains were projected from. I)A characteristic bloodstain pattern containing spurts that results from blood exiting under pressure from an arterial injury J)The acute angle formed between the path of a blood drop and the surface which it contacts K)A pattern of bloodstains formed by the dripping of blood off a moving surface or person in a recognizable pathway separate from other patterns L)Blood that is expelled out of the nose, mouth, or respiratory system as a result of air pressure and/or air flow M)The location in three-dimensional space that blood that produced a bloodstain originated from. N)A bloodstain pattern created when a surface that carries wet blood comes in contact with a second surface. Recognizable imprints of all or a portion of the original surface or the direction of movement may be observed. O)A bloodstain pattern that is created when blood is flung from a blood-bearing object in motion onto a surface -Back spatter

Expirated blood is expelled from the mouth or nose from an external injury.

Match the word in Column 1 to its definition in Column 2. Each answer can only be used once. A)The process by which the edges of a stain will dry to the surface in a specific period of time (dependent upon environmental and surface conditions)and will remain apparent even after the rest of the bloodstain has been disturbed from its original position B)A bloodstain pattern formed by the movement of small or large amounts of blood due to gravity's pull C)A bloodstain pattern produced when an object makes forceful contact with a source of blood, projecting droplets of blood outward from the source D)Blood directed back towards the source of the force that caused the spatter E)An area within a deposited spatter pattern that is clear of spatter, caused by an object or person blocking the area at the time of the pattern's deposition F)Small droplets of blood that are distributed around the perimeter of a drop or pool of blood that were produced as a result of the blood impacting the target surface G)Blood which travels away from the source in the same direction as the force which caused the spatter H)The area on a two-dimensional plane where lines traced through the long axis of several individual bloodstains meet. This approximates the two-dimensional place where the bloodstains were projected from. I)A characteristic bloodstain pattern containing spurts that results from blood exiting under pressure from an arterial injury J)The acute angle formed between the path of a blood drop and the surface which it contacts K)A pattern of bloodstains formed by the dripping of blood off a moving surface or person in a recognizable pathway separate from other patterns L)Blood that is expelled out of the nose, mouth, or respiratory system as a result of air pressure and/or air flow M)The location in three-dimensional space that blood that produced a bloodstain originated from. N)A bloodstain pattern created when a surface that carries wet blood comes in contact with a second surface. Recognizable imprints of all or a portion of the original surface or the direction of movement may be observed. O)A bloodstain pattern that is created when blood is flung from a blood-bearing object in motion onto a surface -Angle of impact

Match the word in Column 1 to its definition in Column 2. Each answer can only be used once. A)The process by which the edges of a stain will dry to the surface in a specific period of time (dependent upon environmental and surface conditions)and will remain apparent even after the rest of the bloodstain has been disturbed from its original position B)A bloodstain pattern formed by the movement of small or large amounts of blood due to gravity's pull C)A bloodstain pattern produced when an object makes forceful contact with a source of blood, projecting droplets of blood outward from the source D)Blood directed back towards the source of the force that caused the spatter E)An area within a deposited spatter pattern that is clear of spatter, caused by an object or person blocking the area at the time of the pattern's deposition F)Small droplets of blood that are distributed around the perimeter of a drop or pool of blood that were produced as a result of the blood impacting the target surface G)Blood which travels away from the source in the same direction as the force which caused the spatter H)The area on a two-dimensional plane where lines traced through the long axis of several individual bloodstains meet. This approximates the two-dimensional place where the bloodstains were projected from. I)A characteristic bloodstain pattern containing spurts that results from blood exiting under pressure from an arterial injury J)The acute angle formed between the path of a blood drop and the surface which it contacts K)A pattern of bloodstains formed by the dripping of blood off a moving surface or person in a recognizable pathway separate from other patterns L)Blood that is expelled out of the nose, mouth, or respiratory system as a result of air pressure and/or air flow M)The location in three-dimensional space that blood that produced a bloodstain originated from. N)A bloodstain pattern created when a surface that carries wet blood comes in contact with a second surface. Recognizable imprints of all or a portion of the original surface or the direction of movement may be observed. O)A bloodstain pattern that is created when blood is flung from a blood-bearing object in motion onto a surface -Impact spatter

The flow pattern on an object or body can help determine if the body was moved after the blood had dried.

A blood droplet deposited at an angle of impact of about 90º (directly vertical to the surface)will:

Match the word in Column 1 to its definition in Column 2. Each answer can only be used once. A)The process by which the edges of a stain will dry to the surface in a specific period of time (dependent upon environmental and surface conditions)and will remain apparent even after the rest of the bloodstain has been disturbed from its original position B)A bloodstain pattern formed by the movement of small or large amounts of blood due to gravity's pull C)A bloodstain pattern produced when an object makes forceful contact with a source of blood, projecting droplets of blood outward from the source D)Blood directed back towards the source of the force that caused the spatter E)An area within a deposited spatter pattern that is clear of spatter, caused by an object or person blocking the area at the time of the pattern's deposition F)Small droplets of blood that are distributed around the perimeter of a drop or pool of blood that were produced as a result of the blood impacting the target surface G)Blood which travels away from the source in the same direction as the force which caused the spatter H)The area on a two-dimensional plane where lines traced through the long axis of several individual bloodstains meet. This approximates the two-dimensional place where the bloodstains were projected from. I)A characteristic bloodstain pattern containing spurts that results from blood exiting under pressure from an arterial injury J)The acute angle formed between the path of a blood drop and the surface which it contacts K)A pattern of bloodstains formed by the dripping of blood off a moving surface or person in a recognizable pathway separate from other patterns L)Blood that is expelled out of the nose, mouth, or respiratory system as a result of air pressure and/or air flow M)The location in three-dimensional space that blood that produced a bloodstain originated from. N)A bloodstain pattern created when a surface that carries wet blood comes in contact with a second surface. Recognizable imprints of all or a portion of the original surface or the direction of movement may be observed. O)A bloodstain pattern that is created when blood is flung from a blood-bearing object in motion onto a surface -Pools

The deposition of backward spatter produced by a gunshot wound is determined by:

Simple ________ patterns are produced when the object makes contact with the surface and is removed without any movement of the object.

The direction of a ________ may show movements of objects or bodies while the pattern was still forming or after the blood has dried.

Match the word in Column 1 to its definition in Column 2. Each answer can only be used once. A)The process by which the edges of a stain will dry to the surface in a specific period of time (dependent upon environmental and surface conditions)and will remain apparent even after the rest of the bloodstain has been disturbed from its original position B)A bloodstain pattern formed by the movement of small or large amounts of blood due to gravity's pull C)A bloodstain pattern produced when an object makes forceful contact with a source of blood, projecting droplets of blood outward from the source D)Blood directed back towards the source of the force that caused the spatter E)An area within a deposited spatter pattern that is clear of spatter, caused by an object or person blocking the area at the time of the pattern's deposition F)Small droplets of blood that are distributed around the perimeter of a drop or pool of blood that were produced as a result of the blood impacting the target surface G)Blood which travels away from the source in the same direction as the force which caused the spatter H)The area on a two-dimensional plane where lines traced through the long axis of several individual bloodstains meet. This approximates the two-dimensional place where the bloodstains were projected from. I)A characteristic bloodstain pattern containing spurts that results from blood exiting under pressure from an arterial injury J)The acute angle formed between the path of a blood drop and the surface which it contacts K)A pattern of bloodstains formed by the dripping of blood off a moving surface or person in a recognizable pathway separate from other patterns L)Blood that is expelled out of the nose, mouth, or respiratory system as a result of air pressure and/or air flow M)The location in three-dimensional space that blood that produced a bloodstain originated from. N)A bloodstain pattern created when a surface that carries wet blood comes in contact with a second surface. Recognizable imprints of all or a portion of the original surface or the direction of movement may be observed. O)A bloodstain pattern that is created when blood is flung from a blood-bearing object in motion onto a surface -Transfer pattern

Name and describe two methods for documenting bloodstain patterns.

When an object blocks the deposition of blood spatter onto a target surface or object, the result is a: