When combined with the incredible science of DNA analysis, forensic serology often provides the indisputable piece of evidence that places a suspect at the scene of a crime and ultimately puts them behind bars. It is the hard science behind thousands of real-life cold cases finally being solved.
Why is serology important in forensics?
The Forensic Serology Section is primarily responsible for the detection and identification of biological material (i.e., blood, semen, saliva, and urine) on physical evidence in order to: Link suspect(s) and victim(s) to each other and/or to the scene(s) Include or exclude potential suspect(s) or victim(s)
What is serology in criminal investigation?
Forensic serology is the detection, identification, classification, and study of various bodily fluids such as blood, semen, saliva, urine, breast milk, vomit, fecal matter and perspiration, and their relationship to a crime scene.
Why Forensic Serology is important and discuss what is the importance of blood in forensic science?
It is commonly recovered in cases of homicide, assault, and terrorist attacks, including bomb blasts. Blood as evidence holds significance in the criminal justice system as it can link a crime with a criminal or exclude an individual’s involvement in a crime.
What is the importance of blood in forensic science?
Blood is one of the most important biological traces that are often found on the crime scene. Due to valuable information it contains, it is considered to be a very important forensic tool.
What are the benefits of blood evidence?
Properly collected and preserved blood evidence can establish a strong link between an individual and a criminal act. Blood evidence or the lack of blood evidence can also be used to bolster or contradict a witness statement or any statements that the suspect may make.
What are the uses of serology in investigation?
Serology is used to find evidence of an identifiable body fluid, while DNA analysis seeks to accurately match those fluids to a specific individual.
What are the two basic types of blood evidence?
There are two different types of blood that can be collected at a crime scene: liquid and dried blood. Liquid blood evidence is generally collected from blood pools but can be collected off of clothing as well, using a gauze pad or a sterile cotton cloth.
What criminalist means?
criminalist in American English
(ˈkrɪmənəlɪst ) an expert in the use of scientific methods to investigate crimes, specif. by collecting and analyzing physical evidence; forensic investigator.
What does the phenolphthalein test tell you?
Phenolphthalein is a presumptive test that reacts with the heme molecule present in blood. A positive reaction gives a pink color. … The swab in the image below shows the characteristic color of a positive reaction with the phenolphthalein test, indicating the presence of blood.
What type of DNA is easiest to collect?
Mitochondrial DNA, because is found small structures outside the nucleus of a cell and is inherited from the biological mother.
How do you know if your blood is human?
Once a presumptive test indicates that a stain may be blood, the serologist must confirm that it is human blood. Precipitin test identifies the presence of proteins that are found only in human blood. On the surface of red blood cells are molecules (proteins) called antigens.
How can you tell if blood is from a human or animal?
How it works: The Ouchterlony test is used to determine if a blood sample is human or animal through the comparison of its reactions to specific antibodies. A sample of the unknown bloodstain is placed in a well in an agar gel.
What are the 4 main components of blood?
It has four main components: plasma, red blood cells, white blood cells, and platelets. Blood has many different functions, including: transporting oxygen and nutrients to the lungs and tissues.
Is blood Type Class evidence?
Class evidence consists of substances such as blood and hair, which can be used to place an individual in a general class but cannot be used to identify an individual. For example, blood typing can be used to establish whether someone has A, B, AB, or O blood, but cannot point to a person.
Can too much luminol destroy DNA?
Our findings indicated that luminol had no destructive effect on species tests as well as on elution method for the detection of blood group antigens and does not have an adverse effect on subsequent DNA typing using PCR.