What are the units of a crime lab?

What are the units of a crime lab?

Crime Lab Units Flashcards Preview

• Biology unit. Staffed with biologists and biochemists who identify and perform DNA profiling on dried bloodstains and other bodily fluids.
• Firearms unit.
• Document examination unit.
• Photography unit.
• Toxicology unit.
• Latent fingerprints unit.
• Polygraph unit.
• Voiceprint analysis unit.

Which unit of the crime laboratory follows specific procedures to maintain chain of custody?

Evidence-Collection Unit

What are the 16 crime lab units?

Terms in this set (14)

• Physical Science Unit. The physical science unit uses chemistry, physics, and geology techniques to compare and identify evidence from a crime scene.
• Biology Unit.
• Firearms Unit.
• Document Examination Unit.
• Photography Unit.
• Toxicology Unit.
• Latent Fingerprint Unit.
• Polygraph Unit.

Which unit analyzes body fluids?

The toxicology unit often supports the work of the medical examiner and may be located within that office. Forensic toxicologists evaluate organs and bodily fluids to determine the presence of any substances that could have caused or contributed to death, such as drugs or poisons.

Who is responsible for examining the body for forensic evidence?

Forensic scientists examine and analyze evidence from crime scenes and elsewhere to develop objective findings that can assist in the investigation and prosecution of perpetrators of crime or absolve an innocent person from suspicion.

What blood tests do forensic scientists use to test?

Blood

• Phenolphthalein Test. Also known as the Kastle Meyer Test.
• Luminol Test. How it works: A chemical compound, known as Luminol, is used in solution or sprayed onto suspected surfaces.
• Alternative Light Sources.

What are three types of tests that can be done to determine if blood is present?

During a routine physical, a doctor may order one of the following tests:

• Complete blood count. A complete blood count (CBC) measures a variety of the blood’s components, such as:
• Blood enzyme tests.
• Blood clotting tests.
• Lipoprotein panel.
• Basic metabolic panel.

What three questions should the investigator?

What three questions should the investigator answer when examining an apparent dried bloodstain? -is it blood? -is it human or animal? -what is the blood type?

What is the principle of Takayama test?

Introduction: Takayama Assay is a test first discovered in the 1912. The assay works by testing a sample with a pyridine and glucose reagent. In the presence of blood, the reagent (pyridine and glucose) reacts with the heme group in blood and produces hemochromogen crystals.

What is the Takayama test used for?

Takayama test is a confirmation test used to detect blood spots. Based on the research results this test can still be used to identify dried blood spots on clothing aged 20 years, and able to detect positively the presence of blood with the formation of pink crystals.

What is the precipitin test used for?

Coccidioides precipitin is a blood test that looks for infections due to a fungus called coccidioides, which causes the disease coccidioidomycosis or valley fever.

What is the limitation of Takayama crystal test?

This constitutes a negative takayama test. It is important to also keep in mind the limitations of a takayama test, as it can only definitively tell if blood is present, but can not be used to make determinations on whose blood or what blood type is found. Hope this helps!

Can Takayama test determine whether a bloodstain is human or not?

Microcrystalline tests, such as the Takayama and Teichmann tests, depend on the addition of specific chemicals to the blood so that characteristic crystals will be formed. Once the stain has been characterized as blood, the precipitin test will determine whether the stain is of human or animal origin.

What is the name of the crystals found in Takayama test?

Takayama test is one of the micro-crystal confirmatory tests for the blood that is frequently used in forensic laboratories. It is also called Hemochromogen test, and a positive result is indicated by the pink feathery crystals of pyridine-hemochromogen.

What are the shape of the crystals for Takayama test?

The appearance of pink needle shaped crystals of pyridine Haemochromogen (Pyridineferroprotoporphyrin) is positive reaction for haeme and confirms the presence of hemoglobin.

What is the luminol test?

Luminol Test. Visitors mix a solution of luminol with fake blood (hydrogen peroxide) to produce a reaction that gives off blue light. OBJECTIVES: Visitors learn that some chemical reactions release energy in the form of light, and that this process is called chemiluminescence.

What is Haemin Crystal?

noun. biochem haematin chloride; insoluble reddish-brown crystals formed by the action of hydrochloric acid on haematin in a test for the presence of blood.