Tuesday, September 8, 2009

Forensics Hair and Fiber

Cornelius Chavis

Hair/Analysis
A hair analysis determines exactly what chemicals are inside of you, including radiation, heavy metals like mercury, food chemicals such as aspartame, pesticides, bacteria and more. Hair analysis was first started in Europe to track down murder, rape, and robbers because they leave a trace where they can help identify the criminal more quicker. The protein in hair fiber holds the composition of the body tissues for a permanent period. By analyzing the hair fiber composition, a trained eye can tell what toxins have connected in the body tissues and what vitamins and minerals are emptied or too rough causing an problem in body function.

Techniques Used to ID Hair/Fiber

  • Find Achohol abusers
  • Find drug addicts
  • Identify criminals
  • Identifty a criminal case
  • Find toxic substances


    Guesses/Justifications of Lab Findings
From the hair samples given I believe the long black hair can come from a female of the African American or Hispanic race. The other hair sample believed to be silver can come from a cocasion male or female with silver like substance in their hair which can through a regular persons hair off course.

Forensic Crime Scene Investigation

Cornelius Chavis

During the days the Wednesday 9-3-09 and Thursday 9-4-09 we had an investigation of a crime committed in which may have been a homicide or murder. Me and my group, group with the crew of: detective Lindi, detective Kelly, detective Noah, and detective Abrea have observed strands of evidence during the crime. We all discovered that there was a trace a blood, a footprint of the murder victim, his wallet filled with info that could lead to the crime and two strands of hair which could have been from the criminal and victim. The wallet contained a lot of supplies seen as such as a threat note, a number and time probably to seal the deal, life-insurance cards, and credit cards; but as we compared this to the footprint I could tell it was first-degree murder. The situation was that the victim was shooting as soon as he heard someone banging on his door and as soon as he stepped out for a few seconds the suspect strike and killed the victim by strangling him to death with a rope which left some hair samples to determine the murder was contact-to-contact.

Forensics Blood Type

A blood-group is or blood-type is a identification of blood on the presence or absence of inherited antigenic substances on the surface of the red blood cells.


Major Types of Blood

There are four different major types of blood which are the blood types A, B, O, and AB which can be both considered positive and negative. The AB blood type can receive blood from any kind of blood cell, and the O blood type has a the use of giving blood to any type of blood cell. All of the blood types together form one group called the ABO blood group system which is found in the human blood transfusion which are associated with the associated anti-A antibodies and anti-B antibodies, which are usually produced in the first years of life by sensitization to environmental substances such as food, bacteria and viruses.



Comment on Ability of Blood Mixing and Transfusions


Blood transfusing is the organized process of transferring blood from one person to another person who is in need of that blood. Blood transfusions are given to increase and enhance the blood's ability to carry oxygen, to restore the body's blood volume when someone has lost plenty of blood, to decrease the blood clotting, and improve a person's immunity to infection. Their is a liquid part of the blood which are blood components which include red blood cells, white blood cells, platelets, immunoglobulins, or a fresh frozen plasma.


What is meant by Positive or Negative Blood Types?


Like before there are a four different types of blood types in the ABO blood group system which are A, B, O and have a positive or negative. Their are results of getting a positive or negative in any kind of blood which means if people with A positive blood types can gain A positive, A negative, O positive, O negative; and can be safely given to people with A positive or AB positive blood types. People the blood type of B can gain A negative, A positive, O negative, O positive; and can be given to people with A negative or AB negative.



Comments and Analysis on Lab Findings.
  • They say the darker the blood the more its positive.
  • The lighter the blood is the more its negative.
  • The blood sample giving to us seems more positive because of the darker fluid in the blood.
  • The blood added with the antigen-A turned blue.
  • The blood added with the antigen-B turned yellowish-orange.

Thursday, August 27, 2009

Forensics Handwriting





Cornelius Chavis

What is forensics handwriting?



Graphology is the study and analysis of handwriting especially in relation to human psychology. In the medical field, it can be used to refer to the study of handwriting as an aid in diagnosis and tracking of diseases of the brain and nervous system. The term is sometimes incorrectly used to refer to forensic document examination.
Graphology has been a controversial field for more than a century. Although supporters point to the anecdotal evidence of thousands of positive testimonials as a reason to use it for personality evaluation, most empirical studies fail to show the validity claimed by its supporters.




Handwriting can be used in many situations such as:


  • Forged, altered or counterfeit documents

  • Checks, Wills, Deeds, Legal Contracts

  • Insurance Records

  • Court Documents

  • Medical Records

  • Computer-printed or Typewritten Document

  • Photocopied or Facsimile Documents

  • Latent Impressions

  • Case preparation consultation

  • On-site examination

  • Laboratory examination and analysis

  • Document photography

  • Preparation of court exhibits

  • Preparation of written reports

  • Deposition or courtroom testimony

Issues with handwriting?


The premises underlying handwriting examination and identification are that (1) No two writers share the same combination of handwriting characteristics and (2) Each writer has a range of variation centered within his/her basic writing habits. A proper examination requires sufficient samples of comparable "questioned" and "known" handwriting that are naturally executed. If adequate samples are available, an examiner conducts a side-by-side comparison, including a visual and a microscopic study.


Techniques and uses for handwriting:


In the context of modern forensic science, experts sharply distinguish graphology from true handwriting analysis. Graphology, scientists attest, is a pseudoscience, a fun but not scientifically valid parlor game, like palm reading, although many corporations take it seriously enough to hire graphology experts to profile job candidates. Over the following three centuries, Italian, French, and German investigators attempted to place the fledgling science of graphology on a firmer scientific footing. In particular, they linked graphology with Gestalt psychology, maintaining that handwriting originates in the brain and therefore betrays characteristics of the writer's mental makeup, even when done with a writing implement held in the other hand, the mouth, or the toes.






















Monday, August 24, 2009

Forensics fingerprinting

Pictures of Fingerprints
(Can you guess the pattern)



















Sample of a Fingerprint Card


The information on a finger print card must be typed or printed legibly. There can not be any marks or highlighters used on the card. The information in each block must be filled out correctly. If the card is not filled out correctly, it can delay results.




This is an example of an FBI card

















Fingerprint




What is a Fingerprint?

A fingerprint is an impression of the underside of the end of a finger or thumb. Your fingerprint is very unique, because no two people have the same pattern. A fingerprint is used to identify a person. There are two ways to identify a person by using the fingerprint method. The first way is by using your fingers and thumbs. The second method is by using palm prints and footprints, this method is used on infants.




How the Fingerprint method works?


Traditionally, impressions have been taken from a person using ink and paper, but in live-scan fingerprinting electronic images produced by a video scanner are converted by computer into binary codes, which can be more readily compared. (The Columbia Encyclopedia, Sixth Edition. Copyright 2008 Columbia University Press. ) A known print is intentionally recording of the friction ridges, usually with lank printers ink rolled across a contrasting white background that's usually a white card. When friction ridges come in contact with a surface that's receptive to a print, material on the ridges, such as perspiration, oil, gas, ink, etc. which could be transformed into a item.








How fingerprints are used in our daily lives






1. In Crime Investigation



2. To prevent identity theft



3. To prove identity of a dead person



4. Identify bombers



5. Find drugs



6. Find explosives



7. Identify DNA



8. Reveal addicting habits










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