Thursday, November 17, 2011

Handwriting Analysis

History Of Handwriting Analysis

            Hand writing analysis, known as graphology is the study of a person’s hand writing (obviously) as well as whether or not an article of writing is forged and even the character of the writer. The first direct research document was a book written by an Italian physician named Camillo Baldi written in 1622 but evidence shows that there was interest over 2000 years ago. Later in the 1870’s Frenchman Jean Michon would coin the name graphology as well as expand on its research. His work started a growing interest in graphology that moved through Europe.

            In 1897 a man froms Switzerland known as Dr. Max Pulver made a further contribution to graphological research regarding symbolism in handwriting. In both direction and in symbolism of space, His division of the handwriting into the three vertical 'zones' explains aspects of the handwriting previously misunderstood;  vertical movement, horizontal movement, and depth.

In 1979 a company known as HRC revolutionized handwriting analysis with a hand writing analyzing program known as the computer handwriting analysis profile system (aka CHAPS). This development created an accurate way of matching characteristics of an individual with their hand writing.

The Components of Calligraphy

            In hand writing analysis forensic scientists have determined 12 basic characteristics of identification. These 12 are used to determine criminal messages as well as forgeries. They components are as followed.

  • Line Quality –are lines faded or thick    
  
  • Size consistency – Compare ratio of height to width
  •  Word and Letter Spacing– Is the writing spaced out or crowded
  • Connecting letters – are capitals and lower-case letters connected and continuous?
  • Letters complete – are letters fully written or partially ?
  • Continuous - Does the pen lift or is it continuous writing?
  • Cursive/Printed – cursive printed or both (when)
  • Pen Pressure – equal up and down strokes
  • Slant – does it lean left or right? Does it even slant?
  • Flourishes or Embellishments – Does it have fancy curves?
  • Diacritic Placement – correct, misplaced, t’s crossed towards top/bottom, i’s dotted? Dotted to the right/left/centered?
  • Line Habits– above line, below line, on line?

Forgery!

      The main purpose regarding handwriting analysis is determining forgeries invalid and scientists have thus created a protocol for determining validity. As stated in the previous section there are 12 main characteristics of forgery.  The following image is of my personal handwriting (frightening) of the sentance "The quick brown fox jumped over the lazy dog."

      In most cases of freehand forgery a forger copying a signature might make awkward starts and stops. This is due to the fact that a forger may reposition a pen to get the right spot, and when finished with a certain piece of the writing will firmly lift up to end their writing to avoid any errors but in doing this leaves behind an identifiable mistake. This will result in signs of hesitation and pen lifts. These traits can be observed in this person's forgery of my hand writing. As it can be seen there are more distinct and static lines as 'Bruce Wayne' tries to mimic my erratic handwriting.


      While freehand forgeries have a lot of dissimilarities between the original piece and the copy, trace forgeries are almost identical to the original work in almost every aspect. That in itself gives it away as no two signatures (even if by the same person) are 100% identical. Trace forgeries are preformed typically by holding the origional signature and document destined to bear the fals signature to a light source and copy the image, while another method is to place pressure on the origonal document in order to leave an idention on the sheet behind it which will then be traced directly. The giveaway in this picture is that it is almost identical to the origional and it also has distinct lines from where the pencil was pressed (the forger did not start the cursive replica).

From reviewing the types of forgery I believe that trace forgery is a much easier method as opposed to free handing as you can succesfully replicate an identical copy. However I feel that trace forgeries can be much more easily identified as they will bear an uncanny resembalence to the origional document.



Infamous Case
At the end of WWII the plane carrying Hitler's private archives crashed, apparently destroying Hitler’s written archives for good, however no evidence of them being destroyed could be found. Later a man named Gerd Heidemann purchased the first volume of Hitler's diary from a man who claimed he acquired them from an East German general. Heidemmann’s supervisor purchased the copies for a substantial amount of money without checking for authenticity. Debates arose about the authenticity when people noticed the similarities between the articles and another published work. Upon further inspection the writing in the diaries didn’t match up well with Hitler’s and labels on the diary, supposedly meant to have been typed in 1943, were dated only to have been written 9 years earlier through handwriting analysis. The diary's binding contained polyester threads which were not first manufactured until 1953 and the paper also contained a type of fluorescent brightener that was not introduced until 1954. The forger of the diary and Gerd Heidemann were both sentenced to four and a half years in jail based on this evidence.
This document is Hitler's own photographed hand writing, compare it to the forgery from the book mentioned in the above paragraph.
 While the image is blurry you can still see slightly heavier lines in sections as well as it's rigid structure. This most likely was a free handed forge.
Bibliography

Wednesday, November 16, 2011

Finger Print Analysis

History of Fingerprinting


            While it is difficult to predict the exact time in which the first fingerprint analysis was used forensic scientists have managed to uncover fingerprints dating back to the 3rd century B.C. This documentation was from ancient china in which thumb prints were found to be used in business transactions as a seal of approval. Another ancient use was in Persia where government officials used fingerprints for documents as they denoted no two fingerprints were the identical.




            The first interest taken in fingerprints in the western world was in 1684 when Dr. Nehemiah Grew documented the basic structure of fingerprints including ridges spirals etc. In 1880 Dr. Henry Faulds was credited with the first identification of a fingerprint found on a greasy alcohol bottle. By 1892 Sir Francis Galton developed the very first classification system of fingerprints.


Around 1846 the FBI has developed AFIS technology for classifying and sorting through the hand cards of fingerprints revolutionizing the use of prints in crime solving. By 1911 the first person to be convicted based primarily off finger print evidence in the western world was of a murder which occurred during a burglary. Charles Hiller had awoken one night to find that a light he had left on that night had been extinguished, upon investigating the house he came face to face with an intruder who reacted by shooting Charles twice killing him. When police investigated the seen they saw four fingerprints near a window imprinted on freshly painted veranda. Police eventually traced these prints to Thomas Jennings who upon this evidence managed to put on trial. The evidence was scientifically indisputable which led to Jennings conviction and execution.


Types of Finger Prints


            As there are different circumstances there are different types of finger prints, the three primary ones are latent prints, direct prints, and plastic prints.
Latent prints are prints that are not readily available to the naked eye as well as they are often left behind on unknowingly. These marks are usually the result of natural oils secreted from the body which can be accumulated on the fingers via friction. Once a criminal (or anyone) touches an object the adhered oils will leave behind an imprint of the finger which forensic scientist can then reveal with various techniques.
            Direct prints are much more easily identified as they are not as concealed as latent prints. Direct prints are prints left behind from other substances such as blood, or fresh paint as well as dirt left on a person’s finger. These types of prints leave behind much more noticeable residue and therefore do not need any special treatment to reveal.
          Lastly we have plastic prints which leave three dimensional marks. Plastic prints only occur when a person’s finger presses into a relatively soft/impressionable substance such as wax or putty and can even be left behind in dust. Since they leave direct indentions plastic prints do not require special equipment to locate.
Basic Shapes/Patterns
            Even though all fingerprints are different they all have basic patterns that they follow These basic patterns are broken into 3 main groups; loops, whorls, and arches.

Loops
            Loops are classified as fingerprints with ridges coming in from one side then curving back out towards the side they came.
            Radial loops- Loops that form downwards and curve towards the radius (thumb side)  
            Ulnar loops- Loops that flow towards the ulnar (little finger side). Ulnar loops are more common than radial loops.
Whorls
            Whorls are fingerprints with a circular pattern originating from a core. Whorls are approximately 35% of the patterns found in fingerprints and can be broken down into 4 main categories.
Plain whorls – which are composed of multiple circles like a bull’s eye target.

Central pocket loop whorls – Whorls that resemble a loop with a plain whorl towards the center.


Double loop whorls  This fingerprint looks as if two loops collided forming an ‘S’ like pattern.




Accidental loop whorls – These whorls don’t fit in with the other categories, however they still have a core and resemble a warped whorl.




Arches
            Arches are the final type of fingerprint type, they are classified by ridgelines that rise in the centre and create a wave like pattern. They are the least common type of fingerprint pattern making up only 5% of the populations prints.

Plain Arch- Plain arches have only a slight rise towards the center in their wavelike pattern.


Tented Arch- Similar to plain arches only with a higher rise in the wave pattern.


Techniques for developing and collecting prints
            Once a forensic scientist understands the basics of fingerprints they must be able to develop them to a state where they can be analyzed as well as lifting them for research later. To do this there are a variety of methods using various chemicals the first of which we will discuss is the most commercially known, fingerprint dusting.
            Fingerprint dusting is used to identify latent prints on non-porous surfaces such as glass, tiles, and metal. This method usually makes use of black power (made from carbon or charcoal) and grey powder (made from aluminium or titanium powder). The fine powder sticks to the oil residue left behind by the print. Once the print is revealed it is either preserved photographically or lifted with a sticky tape. The con of this method is that it has to be done fairly shortly after the fingerprints are left as the oils in them dry out with time.
            Another method that can be used on hard surfaces involves the use of chemicals. This method is the combination and heating of super glue (which is mostly composed of cyanoacrylate) and sodium hydroxide. The fumes from this heated mixture bond with amino acids which are found in the oils on the print and make a hard print which can then be photographed and analyzed.
            If the print is not on something as hard and smooth as glass or metal this method
involving ninhydrin (triketohydridenehydrate). By exposing a porous surface (i.e. cardboard)

 to  this chemical the chemical slowly reacts with the oils and proteins in the fingerprint.

After several hours a purplish-blue print will appear. While slow this method can be used