Exam 4: Crime Scene Reconstruction: Blood Stain Pattern Analysis

Proper location and documentation of bloodstain patterns at the crime scene is the responsibility of:

Forward spatter is more likely to be deposited on the object or person creating the impact.

Which of the following is of paramount importance in the interpretation of bloodstain patterns?

A bloodstain that impacts a surface at a low angle with have a shorter tail than one that impacts at a higher angle.

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 -Area of origin

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 -Drip trail pattern

Which weapon would create cast-off patterns consisting of small droplets in a linear pattern?

The intersection of straight lines through the long axis of several individual bloodstains in an impact spatter pattern illustrates the ________ of the pattern.

Drops propelled from a small or pointed surface will be smaller and the pattern more linear.

What is created when an object with blood on it touches one that does not have blood on it?

Rough surfaces usually result in stains with:

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 -Cast-off

A(n)________ pattern is a pattern made by drops or large amounts of blood flowing by the pull of gravity.

The first transfer pattern will be lighter in color while subsequent transfers will be increasingly dark and heavy.

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 -Void

In general, as both the force and velocity of impact increase, the diameter of the resulting blood droplets increases.

Drops propelled from a pointed surface will be smaller and the pattern more ________.

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 -Flow pattern

During crime-scene reconstruction, no evidence or data should ever be excluded.

Physical evidence that can be used to aid in a crime-scene reconstruction includes: