Blood Transfusions~

The table above portrays the different blood types and there compatibility to one another. This is all based on the idea of transfusion. Transfusion is the process of transferring blood, or blood based products from one person, into the circulatory system of another. Although this may sound like a simple process, it is actually quite complicated. Not only does each individual have different types of blood, but if some of these different types of blood were to mix with another type of blood, then your immune system may form antibodies and begin attacking the donated blood. Furthermore, above you will notice that blood O negative is the Universal Donor which means it can successfully be donated to every type of blood without harm. You will also notice that blood AB positive is the Universal Receiver which means that it can receive any type of blood successfully. Every other blood type has restrictions as you will notice in the table above.

Information:

http://en.wikipedia.org/wiki/Blood_transfusion

Major Types of Blood~

There are four main types of blood, A, O, AB, and B. Each of these types is divided into two different types: AB+, AB-, O+, O-, A+, A-, B+, and B-. As you can see, the blood types are divided between positive and negative types. The main difference between positive and negative blood types is the positive has the RhD antigen, while the negative does not. RH is a complex way of classifying blood.

Picture and Information:

http://en.wikipedia.org/wiki/Blood_type

Techniques Used to ID Hair/Fiber~

Hair and Fiber:

Today hair and fiber has become a very important clue to police when trying to catch the culprit of a crime. In a very thin strand of hair police are able to identify the drugs or poison the person has had and the race of the person (Asian, African American, White). . Although, if the hair has been dyed or a certain chemical is put in the hair, the hair might change its style and the way it looks under a microscope, giving the police a false clue. However with fiber, scientists are able to determine where crime scenes occured and vertify that they are searching for the correct criminal. Also, once the fiber is formed, its type cannot be changed therefore the mix ups with fibers are very rare. Furthermore, forensic scientists have been able to identify the three main types of hair: Coronal, Spinous, and Imbricate and two main types of fiber: Natural and Man- Made.

Pictures:

http://www.cgakhaltekes.com/index_image3798.gif

http://www.fbi.gov/hq/lab/fsc/backissu/jan2004/research/images/fig03.jpg

http://foileducation.com/Forensics/hair_files/image006.jpg

http://www.kongfi.com/cp/cp2b.jpg

http://216.38.51.43/microsites/education/treks/primitive/images/Cordage-from-natural-fibers.jpg

Information:

http://www.fbi.gov/hq/lab/fsc/backissu/july2000/deedric1.htm

Handwriting Forgery~

As another part of our lab experiences in Isaac Bear, each student made a fake check, using a fake name, but writing in our own handwriting. Next, we were to rip our check apart and place it into an envelope. Mr. Kelly then mixed up the envelopes and gave us each a different envelope with a different check. We were then required to put the check back together and identify the person who wrote the check. After comparing the handwriting of the check to my classmate’s handwriting, I was able to discover the owner of the check. This method of Handwriting Analysis is not accurate but sometimes used when trying to catch the criminal of a crime. I can only imagine the difficulty the police go through when comparing the different handwritings, although, in todays society we have technology for this sort of thing.

Inaccuracy in Handwriting Analysis~

Although a note left by a criminal could become another helpful clue for police in the middle of solving a mystery, sometimes it is very inaccurate. Inaccuracies in handwriting analysis may include the following:

1. Criminal may change the style of his/her writing forming a false clue

2. The writing may be smudged

3. The note may be typed

4. The criminal might have framed someone else by allowing them to right the note

5. Depending on the instrument, the writing may thicker/thinner

6. The writing may be a bit skewed if the person writing the note was in a rush

Picture:

http://www.shelbycollinge.com/Handwriting-style-main_Full.jpg

History of Handwriting Analysis~

Handwriting analysis is basically a comparison between two or more documents and determining whether or not the same person wrote both documents. Throughout the years, handwriting analysis has gotten more accurate and police are sometimes able to use it as a valid clue. Although, in the 1980's handwriting analysis was not very authentic because a man named Konrad Kujau was able to trick all by forging a few diaries he stated was written by Hitler. Kujau reported to the police that he had found a lost diary of Adolf Hitler in an airplane wreckage after World War II. After police compared the diary with known exemplars written by Hitler, they stated that the diary was truly written by Hitler and Kujau received 2.3 million dollars. It was not until years later was Kujau identified as a liar, for he forged the diaries and the 'exemplars'. Kujau was caught because apparently, the paper Kujau used had a special ingredient that was not used in paper until 1954, whereas Hitler passed away in 1945.

Information:

http://science.howstuffworks.com/handwriting-analysis2.htm

Techniques and Indicators Used to Identify Handwriting~

When trying to identify the culprit of a crime, Forensic scientists are usually needed to analysis handwriting. The twelve main characteristics for comparing handwriting are as follows:

1. Line quality: Do the letters flow or are they written with very intent strokes?

2. Spacing of words and letters: What is the average space between words and letters?

3. Ratio of height, width, and size of letters: Are the letters consistent in height, width and size?

4. Lifting pen: Does the author lift his or her pen to stop writing a word and start a new word?

5. Connecting strokes: How are capital letters connected to lower case letters?

6. Strokes to begin and end: Where does the letter begin and end on a page?

7. Unusual letter formation: Are any letters written with unusual slants or angles? Are some letters printed rather than written in cursive?

8. Pen pressure: How much pen pressure is applied on upward and downward strokes?

9. Slant: Do letters slant to the left or right? If slant is pronounced, a protractor may be used to determine the degree.

10. Baseline habits: Does the author write on the line or does the writing go above or below the line?

11. Fancy writing habits: Are there unusual curls or loops or unique styles?

12. Placement of diacritics: How does the author cross the t's or dot the i's?