Tuesday, November 29, 2011

Drug Analysis

Cocaine:
 1. Chemical Name: Benzoylmethylacgoine
 2. Chemical Formula: C17H21NO4
 3. pH: 4.5
 4. Biochemical Tests: Cocaine can stay in urine and blood for up to 5 days but is detectable in hair for up to 90 days making it easier for a forensic analyst to tell if someone has used the drug in the past three months with just a hair sample.

LSD:
1. Chemical Name:  Lysergic acid diethylamide
2. Chemical Formula: C20H25N3O
3. pH: 4
4. Biochemical Tests: LSD is detectable in urine and blood and can be detected by drug screening procedures as long as it is stored in low temperatures and no light because the drug is very fragile and unstable in heat, light, and alkaline conditions. LSD can also be detectable in urine for up to 24 hours and in blood for 2 to 4 days.



Drug analysis activity:
In class we had six unidentified substances that we had to test with a cocaine detection reagent, an LSD detection reagent, and pH indicator test strips to see if they contain LSD or cocaine. These are the results.

Drug
pH
Cocaine reagent(blue)
LSD Reagent(yellow)
1
6
Positive
Negative
2
9
Positive
Negative
3
3
Negative
Positive
4
7
Positive
Negative
5
6
Negative
Negative
6
5
Negative
Positive

Saturday, November 19, 2011

Lip Print Analysis

Lip prints, like fingerprints, are unique to each person; no two are the same. the characteristics of a lip print can be defined by the height of the arches, slope of the corners, space between lips, and any cracks, scars, or distinctive marks on the lips.

In class each person put down a lip print on an index card and had to identify and label any distinguishing characteristics about their own lips.



Then the class split up into groups of three or four and each person has to lay down another print on the same sheet of white paper in the same orientation. The sheet with all the group member's lip prints is then passed to another group along with  the index cards of each persons individual analysis. The group will then write the defining features they can identify on the white sheet and try to match each print to one of the prints on the index card.

Friday, November 18, 2011

Footprint Analysis

A foot print in a crime scene can be extremely useful to detectives on that crime scene. Prints can tell which way a suspect may have come from of the direction they left. The print tells what shoe size and what type of shoe they were wearing. If the print is good enough and the sole of the shoe isn’t very worn even brand names and designs can be seen, making easier to catch a suspect. Sometimes gender can even be decided based on the size and shoe type of the impression. It is important to analyze footprints quickly since weather condition or other impressions could disturb the print. If a forensics expert does not have time to analyze the print right away they will make a mold of it and analyze it later.
In class we split into groups of about three or four and filled a large rectangle container with dirt/sand. Make sure the dirt is not too moist or else the print will not stay intact for analysis.

Then each person takes turns making their shoe impression in the dirt  must fill out a sheet for each group member’s footprint. This sheet includes the weather conditions, substrate, number of tracks, length and width of print, characteristics of the print, and an overall conclusion for your analysis of the print.

Repeat this process until you have analyzed the footprint of each person in your group.

Questions:
1.  What was you analysis of each print?

The first print we analyzed was a boot with a small slanted heel and we concluded that the person probably wore about a size eight shoe size and may have worn the shoes often since the bottom was so worn that no markings or treads could be distinguished. They were also most likely female because of the size and shape of the shoe.


The second shoe was a boot with a short chunk heel. We decided that the person wears about a size nine in women’s shoes and nothing can be distinguished from the soles since they were so worn.



The last print was from a flat shoe which was about a size eightin women’s and was not very worn since we could see distinct impressions of a flowery vine pattern between the ball and heel of the print.


2.  What are some similarities and differences of each shoe type observed?

We observed three types of shoes, a flat shoe, a boot w/ a small slanted heel, and a boot with a short chunk heel. The flat shoe did not have much of an arch and there was no line or break between the ball and heel of the shoe. The impression also showed that pressure was distributed fairly equally throughout the print.


The boot with the slanted heel was similar to the flat but had a slightly higher arch and the shape was less definite than the flat. There was also a bit more pressure on the heel than the ball of the foot.



The boot with the chunk heel was very different than the other two shoe types. The ball of the foot was somewhat wider than the other two but the most distinct feature was the separation of the heel from the front portion of the shoe. Since the arch is so elevated the heel seems to be unconnected to the ball. Also the heel was farther into the dirt which shows that there was much more pressure on that portion of the shoe.



3.  What are some similarities and differences of male and female shoes?

Although similar in shape the male and female foot mostly differs in size. The male shoe is usually larger than a female shoe since the feet of males are generally bigger than female’s. We noticed that the dimensions of a boy’s footprint were larger in dimensions than the dimension we collected of girl’s footprints.

Create a Profile Activity:

Each group was supplied with five clues that could be used to analyze the crime scene using a magnifying glass and a microscope.
1. Analyze the Clues

Clue 1: Fingerprints
1= plain whorl
2= ulnar loop
3= ulnar loop
4= ulnar loop





Clue 2: Long Hair Sample
-  Red hair (possibly artificially colored)
-  Caucasian (probably female)














Clue 3: Torn Note
-  "You will never find her"
-  Says that the victim was a female
-  She was abducted= unwilling


Clue 4: Small Hair Sample
-  Corse short hair
-  Starts dark brown/black then turns red
-  Could be a piece of hair that shows the original color of and dyed color of the longer sample.


Clue 5: Possible Bloodstain
-  Smeared stain
-  Could be blood, juice, or lipstick/gloss
-  Red/pink color


2. What do you know? What needs further testing? What don’t you know?

From looking at the clues we know the patterns of the fingerprints and from the note we know that the victim is a woman and was taken unwillingly. Also by looking at the first hair sample we concluded that it was a Caucasian hair, possibly the victim’s and would need further testing to know whether it was artificially colored or not. The small hair sample could have been an eyebrow hair or a fragment of the larger hair sample. More testing would have to be done on the hair to see if it was a piece of the larger sample or if it even came from the same person. The red smudge could have been blood, juice, or makeup but more tests would have to be conducted to tell what the substance was, perhaps a chromatography test. What we do not know about the case is the gender of the suspect, who the prints are from, what the red smudge is, and who the hair belonged to.

3. Create a profile

A woman with red dyed hair was sitting at home when someone broke into her house and tried to abduct her. She struggled and was scratched so her blood smeared on the wall hair was pulled from her head. After the kidnaper secured her he/she scribbled a note for the police to find.

4. How could the case be solved?

After the initial analysis of the clues a forensic team could run the finger prints through an automated system to see if there is a match for either the suspect of the victim. Then tests could be run on the possible blood smear and if it was blood the DNA could be extracted and run through another automated system. Hopefully by running these tests would identify the kidnapper and close the case.

Thursday, November 17, 2011

Witness Identification Experiment

This was a basic memory experiment to see if we would make good witnesses.

1. First each person in the group cut out a face from a magazine (the faces should be about the same size)

2. cut the face into major facial features (eyes, mouth, nose, etc.)and mix them all together

3. Each person should make a face from the features in the pile and take ten seconds to try anf memorize them.

4. Put the chosen facial features back in the pile and try to reconstruct the face that your group member showed you.


In this experiment we practiced observing facial detail to determine if we would make good eye witnesses for a crime investigation. By having us reconstruct the faces cut from the magazine we found that it is difficult to recall such minor details especially when we were only given ten seconds to memorize the face and they are blanded together with other features that look simlar and are about the same size.

Forensics Project Part III: Handwriting Analysis

Graphology is the study and analysis of handwriting. Some think that this can effectively assess the writer’s traits/personality. Scientific Handwriting Analysis is used primarily for authenticating a document or signature and has little to do with that person’s make-up or personality.


1. History of Handwriting Analysis

Graphology dates its genesis back to 1622 and maybe even earlier.

Throughout history, scientists, philosophers, artists and others have been interested in the relationship between the handwriting and the writer. This interest appeared as early as 1622. Efforts at handwriting analysis began in 1872, with the work of the French abbe, Hypolite Michon, who gave graphology its name. Michon and his compatriot, Jules Crepieux-Jamin developed the school of isolated signs. This attempted to relate specific handwriting elements to specific human traits.

In 1910, Milton Newman Bunker, a shorthand teacher, in Kansas, wanted to know why, as a penmanship student, he had put wide spaces between his letters and long finals on his words.
In 1915, Bunker made his unique discovery. He recognized that each of his students formed shorthand strokes in a unique manner. He suddenly and clearly realized that it was not the letter which had a trait meaning but the strokes – the shape of the formations within the letter. Graphology suggested that an O with an open top – that is a space opening, indicated a person who would speak very openly and often. He checked and found this to be true. He thought, however, that logically, other letters with the same circle formation (a,g,d & q) should have the same meaning and after checking carefully, he found that they did.

After traveling thousands of miles, and interviewing thousands of people and examining more than half a million handwriting specimens in his lifetime, the copyrighted American System of handwriting analysis - Graphoanalysis was born.



 2. List of 12 Handwriting Characteristics


There is a lot of information that can be gained from writing analysis. When examining handwriting there are 12 characteristics that an expert will consider:


Line quality: Are the pen marks smooth and free flowing or shaky and wavering? This can be connected to the speed that the document was written at.








Spacing of words and letters: What is it the spacing between letters and words? Is it consistent?










Ratio of the relative height, width and size of letters: What is the ratio? Is it consistent?









Pen lifts and separations: Does the person stop to form new letters and begin words? Forgeries may have lifts in unusual places.


Connecting strokes: Are capitals connected to lowercase letters and are there connecting strokes between letters and words?








Beginning and ending strokes: Are these straight, curled, long or short, an upstroke or a downstroke?









Unusual letter formation: Are there any unusually formed letters such as backward, letters with a tail, or unusual capitals?


Shading or pen pressure: Is the pen pressure on the upward or the downward strokes?










Slant: Is slant left or right or straight up and down? Is there consistency between the slant of letters.

Baseline habits: Is the writing above or below a line?











Flourishes and embellishments: Are there any? If so what are they?



Diacritic placement: How are the t’s crossed? Take note of the dotting of i’s, j’s. For example are the dots to the right or left of the letter?











3. Pictures and Analysis of Handwriting Analysis Template.  

Using the Handwriting Analysis Template we were able to analyze our partners writing and attempt to forge it using two different methods. The first forgery method was simply freehand forgery where we tried to replicate the original sentence. After we compare the original to the free hand forgery we could see that the letters of the forgery were not really small enough to match and some of the characteristics were a bit off.


The second was trace forgery where we could either fold the paper so the original sentence was underneath the last forgery box or cut out the last box and hold them up to a window. After this we trace over our partners original sentence to try and duplicate it. By doing this we could compared the original to the trace forgery and noticed that the letters were almost identical to the original.



I think that the tracing technique is easier and more effective for forgery although there could be more obvious signs of this use of forgery. For example, if someone was concentrating very hard they could be putting a large amount of pressure on their pen or pencil which will be evident in the final product. Also if one were trying to be very precise with their strokes it could look a bit shaky from the pressure and concentration.

4. Reflection on the Check Forgery Activity (Explain the steps/process of your check forgery?  Did you and your group identify the proper person/persons who did the forgeries?  Which characteristics were the most distinguishing in your analysis?)

In the Check Forgery Activity each person had to write out a fake check with a made up signature to hide our identities. We then tore up the face checks and paper clipped the pieces together. Then we switch all the torn check and the original handwriting analysis sheets with another group. After this re re-assembled their fake checks and proceeded to compare the writing on the checks to the handwriting analysis sheets. We looked at the shape of the letters as well as any slanting visible. We also noted if the letters were written with more deliberate strokes like print or more fluid letters like in cursive. After we matched each check to an analysis sheet we found that all our identifications were accurate.



5. Research a famous forgery case and explain how forensic handwriting analysis was used to expose the forgery.

A famous case that demonstrates how graphology can be effective in solving crimes occurred on July 4, 1956, when Mrs. Morris Weinberger, a young mother of two, left her 33-day-old baby, Peter, in his carriage on the patio in the backyard of their home in Westbury, Long Island. Although she had been gone for only 15 minutes, when she returned she found the carriage empty and a ransom note that stated a demand for $2,000 and was signed, "Your Baby Sitter." In spite of her broadcast pleas for the return of their child, no further demands were issued by the kidnapper until July 10, when the Weinbergers received a telephone call and a second note.

Under the law at that time, the FBI could not enter a kidnapping case until seven days had passed. Once that time period had been observed, experts began immediately to study the kidnapper's notes. It was decided that the ransom notes had been written on a piece of paper that appeared to have come from a lined tablet designed for use in writing public records. Among distinctive aspects of the kidnapper's writing, there was a peculiarly looped capital "P," a rounded "A" with a short tail, and a capital "Y" that was strangely bold.

Six weeks after little Peter Weinberger had been taken from his carriage, a group of handwriting analysts managed to match the handwriting on the ransom note to that of a signature by a man who had received a suspended sentence. It was the 1,974,544th document that had been studied during the desperate search for baby Peter.

Tragically, the kidnapper, Angelo John LaMarca, who lived five miles from the Weinbergers, had thought he could solve his money problems by snatching a rich family's child. LaMarca had panicked on August 23rd and left the baby in a dense thicket to die. The kidnapper was found guilty of murder and died in the electric chair.

Although handwriting analysis may provide valuable leads that in some cases may lead to the discovery of the perpetrator of a crime and that person's subsequent arrest, the testimony of graphology by itself has not been accepted by appellate courts in the United States. In spite of the claims made by graphologists, the courts have ruled that it does not meet the requirements of the kind of science