Exam 4: Crime Scene Reconstruction: Blood Stain Pattern Analysis

Void spatter is the most common type of bloodstain pattern found at a crime scene.

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 -Expirated blood pattern

Pools of blood are not reliable to use in reconstruction or determining the amount of time that has elapsed since the blood was deposited.

The approximate drying time of a pool of blood can be used to estimate timing of events at a crime scene and is dependent upon:

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

________ spatter is projected outward and away from the source.

The sizes of the drops in a cast-off pattern are not related to the size of the point from which they were propelled.

Define the terms area of convergence and area of origin and explain what each reveals to an investigator.

Drops propelled from a large or blunt surface will be ________ and the pattern wider.

What information can an investigator gain from the location of the area of origin of a bloodstain pattern?

The presence of bubbles of oxygen in the drops can differentiate ________ blood from other types of bloodstains.

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 -Forward spatter

Crime-scene reconstruction requires piecing together:

Often, reconstruction requires the involvement of a medical examiner and at least one ________.

Expirated blood may be lighter in color as a result of dilution by ________.

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 convergence

What conclusion can be deduced if fine droplets of the victim's blood are found inside the muzzle of a firearm at an outdoor crime scene, where the victim suffered several gunshot wounds?

A flow pattern is created when an object blocks the deposition of blood spatter onto a target surface or object.

Typically the blood expelled from impact wounds is not as bright red as the blood expelled from a(n)________.

By counting and pairing the patterns of a(n)________ pattern, an investigator can estimate the minimum number of blows inflicted upon a victim.