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METROPOLITAN UNIVERSITY EDYCATION, SCIENCE AND FORENSIC MACHELOR DEGREE IN CRIMINALISTC AND FORENSIC SIENCE. 

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METROPOLITAN UNIVERSITY EDYCATION, SCIENCE AND FORENSIC MACHELOR DEGREE IN CRIMINALISTC AND FORENSIC SIENCE. 

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PROFESSOR: MAGISTER VIELKA ITZEL CORNEJO ARDINES.
NAME: ALDAIR AXEL CASIANO MURILLO.

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Success in life is not measured by what you achieve, but by the obstacles you overcome.

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Success in life is not measured by what you achieve, but by the obstacles you overcome.

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Types of biological at the crime scense.

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Types of biological at the crime scense.

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the identification of various biological samples at a scense can be significant the presence of certain fluid may be of significance in and of itself additionally biological material can be a source of DNA which can allow an individual to be linked to scence and a specific biological sample.

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1.  What kind of evidence can be found at the scene of a crime?

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1.  What kind of evidence can be found at the scene of a crime?

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stabbing clairvoyonce.
papillary trances
biological evidence.
unrecognized objects.

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2.  What sort of biological evidence is used most nowadays?

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2.  What sort of biological evidence is used most nowadays?

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insects

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- Seach for blood evidence.
- Confirmatory tests.
- a stain could be ketchup, red ink or other red substance make sure its blood before you collect it

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-Explosive
-Firearms & ammunition
-Fibers- typically hair but can be any natural or synthetic fiber to help make conections in a crime
- Fingerprints
-Class- tire marks, shoe prints, bite marks in food
-Organs & physiological fluid- gastric juice for presence of drugs & alchol

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- Evidence collectors and delectives are trained in proper evidence collection techniques and ways to identify which evidence in pertinet but ultimately they must make intuitive, on-the-spot decisiones at the crime scene.

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- saliva is a extracellular fluid product and secretd by salivary glands in the mouth saliva is 98% water but it contains many important substance.

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1. direct evidence - verbal, eyewitness (stong case)
2. circumstantial- physical evidence ( can ID and use for comparison and helps to reconstruct crime scene)

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1. Biological sample- muestras biológicas

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Evidence can be  classified as Physical or Biological.  Physical evidence usually comes from a non-living origin and includes fingerprints, tire tracks, shoeprints and fibers.  Biological evidence includes bloodstains and DNA.

Locard's Exchange Principle states that perpetrators always leave physical and biological evidence at the scene of the crime, and take something away with them.  Such evidence is usually found in very small quantities, and is called trace evidence.

Whatever evidence is found, it is vital to establis a secure chain of custody.  Each person handling the evidence from its collection to its appearance in court must sign for it.  It is also important that evidence not contaminated.  It must be preserved carefully, since items may deteriorate if there is a long interval before the criminal trial begins.

Some kinds of physical evidence such as tire tracks and shoeprints are not enough to convict, because they do not prove the individual's involvement.  This type of evidence is known as class evidence.  Class evidence is valuable if several different types of evidence can be found together.  For example, finding various fibers and shoeprints is more valuable than finding only one fiber.  Then they can be combine to indentify the perpetrator.

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2. DNA- Adn

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5. Salivary gland- glandula salival

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4. Blood- sangre

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3.Linked to scene - vinculado a la escena

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-Blood, semen and saliva- liquid or dried human or animal must be collected and can undergo serological analysis or biochemical anallysis.
-Documents- handwritten or typed.
-Drugs- legal or ilegal.

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La evidencia se puede clasificar como física o biológica. La evidencia física generalmente proviene de un origen no vivo e incluye huellas dactilares, huellas de neumáticos, huellas de zapatos y fibras. La evidencia biológica incluye manchas de sangre y ADN.

El Principio de Intercambio de Locard establece que los perpetradores siempre dejan evidencia física y biológica en la escena del crimen y se llevan algo con ellos. Dicha evidencia generalmente se encuentra en cantidades muy pequeñas y se denomina evidencia de rastro.

Independientemente de la evidencia que se encuentre, es vital establecer una cadena de custodia segura. Cada persona que manipule la evidencia desde su recolección hasta su comparecencia ante el tribunal debe firmarla. También es importante que las pruebas no se contaminen. Debe conservarse con cuidado, ya que los elementos pueden deteriorarse si transcurre un largo intervalo antes de que comience el juicio penal.

Algunos tipos de pruebas físicas, como huellas de neumáticos y huellas de zapatos, no son suficientes para condenar, porque no prueban la participación del individuo. Este tipo de evidencia se conoce como evidencia colectiva. La evidencia de clase es valiosa si se pueden encontrar varios tipos diferentes de evidencia juntos. Por ejemplo, encontrar varias fibras y huellas de zapatos es más valioso que encontrar solo una fibra. Luego se pueden combinar para identificar al perpetrador.

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Tell us a resume in English and Spanish.

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Tell us a resume in English and Spanish.

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6. eyemitness- testigo ocular

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- Eyewitness Drawbacks
1. forgetfulness
2. poor eyesight/ hering
3. Fear
4. Personal bias
5. Impediments- tired- dull - or lack of knowledge.

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7. Serogial- serología

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Tell us a resume in English and Spanish.

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Tell us a resume in English and Spanish.