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Explore the fascinating world of forensic science with a look at DNA evidence, bite marks, fingerprinting, firearm comparison, time of death estimation, fiber analysis, ritualistic behaviors, shoeprints, blood spatter, and accelerants.
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DNA Evidence • Body fluids, such as blood, and saliva, are commonly used in forensic investigations as a source of cells for DNA extraction and analysis. • http://www.courttv.com/forensics/lab/ A distinctive DNA print from a crime scene when matched to suspect's DNA print can place a suspect at the crime scene.
Bite Marks A dental expert, or forensic odontologist, has numerous roles, one of which is to match the bite-mark impressions on a victim to the tooth structure of suspects. Teeth are tools and a tooth mark is like a tool mark. Generally the teeth that leave the strongest impressions are in the front, both top and bottom. http://www.courttv.com/forensics/lab/
Fingerprinting Fingerprints are the unique patterns created by skin ridges found on the palm sides of fingers and thumbs. It is one of the most useful evidence pieces in forensic science. http://www.courttv.com/forensics/lab/
Firearm Comparison Sometimes incorrectly referred to as ballistics, firearms identification can be defined as, ”The identification of fired bullets, cartridge cases or other ammunition components as having been fired from a specific firearm.” http://www.courttv.com/forensics/lab/
Time of Death (TOD) Medical investigators look for various signs to help them estimate a time frame -- usually a 2 to 4-hour window of time -- in which the victim probably died. http://www.pathguy.com/TimeDead.htm http://www.courttv.com/forensics/lab/
Fiber Comparison Placing a suspect at the scene of a crime is an important element in criminal investigation. This can be achieved through the location of fibers similar to those from the victim's clothing or the crime scene on the clothing of the suspect, or through the discovery of fibers like those in the suspect's clothing at the crime scene. This can also be done with hair. http://www.courttv.com/forensics/lab/ Carpet fiber Two matching hairs identified with the comparison microscope
Ritualistic Behavior Investigators look to see whether a crime's method of operation, or MO, was the same or different, and whether either or both crimes involved any ritualistic behaviors that could be used to characterize the suspect. http://www.courttv.com/forensics/lab/
Shoeprints and Casting Characteristics that result when something is randomly added to or taken away from a shoe outsole that either causes or contributes to making that show outsole unique Casting can retrieve a three-dimensionalfootwear impression. http://www.courttv.com/forensics/lab/ Sneaker print with 10 distinctive characteristics creates a fingerprint of the shoe.
Blood Spatter The impact of spilled blood on surfaces. The patter of the impact can provide vital information about the source of the blood. Blood spatter can help determine the size and type of wounds, the direction and speed with which the perpetrator or victim was moving, and the type of weapons used to create the blood spill. http://www.courttv.com/forensics/lab/ http://www.bloodspatter.com/BPATutorial.htm
Accelerants Investigators can prove that a fire was set intentionally by finding an accelerant at the scene of a fire. An accelerant is a chemical fuel that causes a fire to burn hotter, spread more quickly than usual, or be unusually difficult to extinguish. The presence of an accelerant in fire debris can be used as evidence of arson. http://www.courttv.com/forensics/lab/
There are many, many, many more topics of forensics!Check out a book, take CCC’s forensics class, look on the internet, and pass your science classes!
