15 Questions
Which of the following is NOT a step in searching for an unknown blood stain?
Analyzing the stain using a microscope
During the collection of an unknown blood stain, what is the recommended tool to use?
A clean swab or cloth
What is the first step in analyzing an unknown blood stain?
Identifying the location of the stain
Which collection method is commonly used to collect an unknown blood stain from a porous surface?
Cotton swab
Which presumptive test is used to determine if a stain is likely to be blood?
Luminol test
Which confirmatory test is used to definitively identify the presence of human blood in a stain?
Precipitin test
Explain the process of searching for an unknown blood stain.
The process of searching for an unknown blood stain involves visually inspecting the area for potential blood stains, using alternate light sources to enhance visibility, and employing chemical reagents to confirm the presence of blood.
Describe the types of collection methods used for unknown blood stains.
Common collection methods for unknown blood stains include swabbing, cutting, scraping, and lifting. Swabbing is often used for non-porous surfaces, while cutting, scraping, and lifting are commonly used for porous surfaces.
What are the steps involved in analyzing an unknown blood stain?
The steps involved in analyzing an unknown blood stain include conducting presumptive tests to determine if a stain is likely to be blood, performing confirmatory tests to definitively identify the presence of human blood, and analyzing the stain's DNA profile to determine the source of the blood.
Explain the process of searching for an unknown blood stain.
The process of searching for an unknown blood stain involves visually inspecting the area for potential blood stains, using alternate light sources to detect hidden stains, and collecting any potential stains for further analysis.
What are the types of collection methods used for unknown blood stains?
The types of collection methods used for unknown blood stains include swabbing, cutting out the stained area, or using adhesive tape to lift the stain.
Describe the presumptive and confirmatory testing methods used for analyzing unknown blood stains.
Presumptive testing involves using reagents such as phenolphthalein or luminol to determine if a stain is likely to be blood. Confirmatory testing involves using specific tests, such as the Kastle-Meyer test or DNA analysis, to definitively identify the presence of human blood.
Which of the following is NOT a collection method commonly used for unknown blood stains?
Using a vacuum cleaner
Which of the following is a presumptive test used to determine if a stain is likely to be blood?
Chemical spot test
Which of the following is a confirmatory test used to definitively identify the presence of human blood in a stain?
Precipitin test
Study Notes
Searching for an Unknown Blood Stain
- The first step in searching for an unknown blood stain is to visually observe and document the area.
- It is recommended to use a magnifying glass or an alternative light source to aid in the search.
Collecting an Unknown Blood Stain
- The recommended tool to use for collecting an unknown blood stain is a sterile swab or a clean, moist cotton cloth.
- The collection method used for unknown blood stains from a porous surface is the swabbing method.
- Other collection methods used for unknown blood stains include the scraping method, lifting method, and cutting method.
Analyzing an Unknown Blood Stain
- The first step in analyzing an unknown blood stain is to perform a presumptive test.
- The presumptive test used to determine if a stain is likely to be blood is the Kastle-Meyer (KM) test or the Phenolphthalein (PP) test.
- The confirmatory test used to definitively identify the presence of human blood in a stain is the Ouchterlony or the DNA analysis.
- The steps involved in analyzing an unknown blood stain include: presumptive testing, confirmatory testing, and DNA analysis.
Types of Testing
- Presumptive testing methods used for analyzing unknown blood stains include the Kastle-Meyer (KM) test and the Phenolphthalein (PP) test.
- Confirmatory testing methods used for analyzing unknown blood stains include the Ouchterlony and DNA analysis.
Test your knowledge on searching for, collecting, and analyzing unknown blood stains. Learn about the essential steps and recommended tools involved in the process.
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