Blood Evidence According to the Collection and Preservation of Blood Evidence from Crime Scenes by George Schiro, blood evidence associated with a crime can provide information that may solve the case. As you can tell this paper will be about blood evidence and all the aspects that come with it. I’ll be talking about the forensics behind it, the types of blood, dry blood, wet blood, how blood can help with a crime, and blood splatter analysis, etc. Let’s start off with the history of blood. I found that blood has been used as evidence since the 1800’s. I also found in the History of Forensic Science that Thomas Bateman was the first to classify skin bruising is due to extravasation of blood into the dermal tissues. It later advances
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Bloodstain patterns help in solving the crime because if you know which way the direction of the blood is coming then you can recreate the crime scene and get a better view of what happened at the time the crime was committed. Blood never lies. According to Detective Clay Hodson, round drops fall straight, spray of blood means a gun has been fired, and if you have a moving person who is bleeding you can easily track the blood spatter in the direction. The surface can also have an impact in the blood. In our Practical Criminal Investigation, 5th Edition, book by Manuel S. Peña, he states how analyzing blood splatter marks can help “point the origin of the wounds, type of object used to produce the wound(s), relative position of victim and assailant, and the degree of the assault.” (2000, pg. 89). Back to the Forensic Science Central, the article talks about other types of blood splatters. They talk about cast-off stains with usually occurs when moving force cause blood drops to descend from a bloody object in motion. Projected pattern or arterial damage stain is an ejection of pressurized blood onto the a main surface. Pool stains is the collection of vital fluid on a certain surface or, in other words, the amount of blood at a crime scene can tell you if the the victim is likely to be dead or alive. There usually is insect blood which most of the time belongs to flies. They talk about expiration stains which means when you cough …show more content…
We can easily find blood stains by using luminol spray. According to Sergeant Mike McCutcheon’s youtube video on Collecting Blood Evidence, luminol and Blue Star, he discuss how you can find blood stains by using the spray. You can also use Blue Star which will cause the blood to glow with the lights off. Once luminol has been used it destroys the blood for further testing. The luminol fades quickly so you have to be quick to take pictures after you are done spraying the premises. Precipitin is used to determine if the blood belongs to an animal or to a human being. For dry blood they use Takayama and Teichmann which is a crystallization test. Kastle-meyer is also used which is a chemical that turns the blood pink if there is any evidence of blood. Use a flashlight to also look for blood stains. Detective Clay Hodson states that you have to assume that blood can be any color and to include in your report that there might be possible blood. Always cast the light at a 45 degree
Bloodstain patterns help in solving the crime because if you know which way the direction of the blood is coming then you can recreate the crime scene and get a better view of what happened at the time the crime was committed. Blood never lies. According to Detective Clay Hodson, round drops fall straight, spray of blood means a gun has been fired, and if you have a moving person who is bleeding you can easily track the blood spatter in the direction. The surface can also have an impact in the blood. In our Practical Criminal Investigation, 5th Edition, book by Manuel S. Peña, he states how analyzing blood splatter marks can help “point the origin of the wounds, type of object used to produce the wound(s), relative position of victim and assailant, and the degree of the assault.” (2000, pg. 89). Back to the Forensic Science Central, the article talks about other types of blood splatters. They talk about cast-off stains with usually occurs when moving force cause blood drops to descend from a bloody object in motion. Projected pattern or arterial damage stain is an ejection of pressurized blood onto the a main surface. Pool stains is the collection of vital fluid on a certain surface or, in other words, the amount of blood at a crime scene can tell you if the the victim is likely to be dead or alive. There usually is insect blood which most of the time belongs to flies. They talk about expiration stains which means when you cough …show more content…
We can easily find blood stains by using luminol spray. According to Sergeant Mike McCutcheon’s youtube video on Collecting Blood Evidence, luminol and Blue Star, he discuss how you can find blood stains by using the spray. You can also use Blue Star which will cause the blood to glow with the lights off. Once luminol has been used it destroys the blood for further testing. The luminol fades quickly so you have to be quick to take pictures after you are done spraying the premises. Precipitin is used to determine if the blood belongs to an animal or to a human being. For dry blood they use Takayama and Teichmann which is a crystallization test. Kastle-meyer is also used which is a chemical that turns the blood pink if there is any evidence of blood. Use a flashlight to also look for blood stains. Detective Clay Hodson states that you have to assume that blood can be any color and to include in your report that there might be possible blood. Always cast the light at a 45 degree