### Present Remotely

Send the link below via email or IM

• Invited audience members will follow you as you navigate and present
• People invited to a presentation do not need a Prezi account
• This link expires 10 minutes after you close the presentation

Do you really want to delete this prezi?

Neither you, nor the coeditors you shared it with will be able to recover it again.

# Platt CSI

No description
by

## Logan Deane

on 27 May 2014

Report abuse

#### Transcript of Platt CSI

How did we get to our suspect?
First, we got into the storage room (because the 24 card found at the crime scene had the circle of the number 9 colored in which means it can also be 6, so we knew that this might mean 409 could be 406, which is the room number of the storage room.) and found the words "into the woods O-10". Last year's school musical production was Into the Woods, so we went to the auditorium and looked at seat O-10. There, we found the words "XY" written under the seat. XY is a male's chromosomes, so we knew that the murderer had to be a man.
Then, we knew the case was called "Mirror Game", so we looked in the mirror of the 7th grade hall and found these numbers on one of lockers reflected in the mirror.
When we were looking at the bottom of the mirrror from the crime scene, we found the words "ABC, it's as easy as 123." So we decoded the numbers above in letter form. The decoded message says, "my favorite subject is math." So it lead us to the only male math teacher- Mr.Pulley. We collected his evidence and all of it matched, including bloodtype, fingerprints, and his handwriting.
Blood Typing Process
Steps to discovering blood type:
Take blood an put into three small containers
Put Antigen A into first small container and swirl with a tooth pick
Check for clotting
Do the same but using Anti. B (make sure you use a new tooth pick)
Finally do the same but with RH. (Rh tells us if the blood is positive or negative.)
If the blood clots to B and RH it would be B+
Platt CSI
There is a right thumb print on
Handwriting
- Hand writing is an extremely important part of crime scene investigation because everyone has unique parts of their writing and everyone has different writing. When we were first learning how to write in kindergarten and first grade, we developed individual characteristics that are unique to us and distinguish our handwriting from someone else's. Someone who compares handwriting in a murder case is called a handwriting analyst.
Fingerprinting
Fingerprinting is made up of three parts Analysing, comparing, and evaluating.
First you analyse the finger print by marking ridge endings, bifrications, and dots.
Next, you put two finger prints next to each other and starting at the core you count ridges and look for things that are the same and things that are different.
Finally, you evaluate, there are only three possibilities, identification, exclusion, and inconclusion. To identify a finger print you need 10 matches.
Things to look out for in handwriting:
- Spacing of words and letters
- Relative height, width, and size of all letters and words
- Pen lifts and separations
- Unusual and recurring letter formations
- Slant of the writing
- Special flourishes and embellishments
- Beginning and connecting strokes

Killers Blood
Blood type: O+
Victims Blood:

Blood Type: A+
Notice here how the red arrows are marked on our suspect's m's. The m's all looks curvy and round and messy.
Killers Blood
Blood type: O+
Victims Blood
Blood Type: A+
Victims Blood
Blood Type:A+
Scientific Method
The right index finger of Mr. Pulley matches with the finger print on the planner.
It is esential to documant, collect and corectly preserve blood typing evidence
The blue arrows are pointed to the e's. They are all cursive looking and messy again, like the m's.
Since blood evidence associated with a crime it can provide information that may solve the case, it is essential to correctly document, collect, and preserve this type of evidence. Improperly handled blood evidence can weaken or destroy a potential evidence in a case. Blood evidence that is correctly gathered can link an individual person with the crime. Blood evidence can assist the investigator and help them go in the right direction. If you collect and store blood evidence correctly you can use it years later to testify in front of a judge or jury. The largest and best possible thing blood evidence can do is absolutely eliminate one or more suspects.
The green arrows here are pointing to the suspect's t's, and these are the ones that are crossed in the lower-middle part of the letter.
Blood typing
We think these two handwritings are a match for many reasons. When we were looking for handwriting that matched the one in the note, we looked for unusual and consistent letters- especially the c's, the apostrophe, the t's, the e's, and the a's. First, we noticed that the c's are almost identical to the ones that were found on the note found at the crime scene. Also, the apostrophe in both the samples are straight, like a line. The a's look mostly alike, and so do the e's. A big reason why we think this is a match is because they were both written in the same black pen. Ms. Smith's sample is a match to the note in the crime scene.
Blood typing vocabulary:
Antaigen
- a toxin or other foreign substance that induces an immune response in the body, especialy the production of antibodies.
RH-
an antigen occurring on the red blood cells of many humans (around 85 percent) and some other primates. It is particularly important as a cause of hemolytic disease of the newborn and of incompatibility in blood transfusions.
What is blood typing?
Blood typing is a method to tell what specific type of blood you have. What type you have depends on whether or not there are certain proteins, called antigens, on your red blood cells.

Blood is often grouped according to the ABO blood typing system. This method breaks blood types down into four categories:

Type A
Type B
Type AB
Type O
Your blood type (or blood group) depends on the types that are been passed down to you from your parents.
Blood typing is a method to tell what specific type of blood you have. What type you have depends on whether or not there are certain proteins, called antigens, on your red blood cells.

Blood is often grouped according to the ABO blood typing system. This method breaks blood types down into four categories:
Type A
Type B
Type AB
Type O
Your blood type (or blood group) depends on the types that are been passed down to you from your parents.
Handwriting Conclusion-
With the handwriting samples, we conclude that Mr. Pulley's handwriting matched the one in the planner. Ms. Smith's handwriting matched the one in the note, but the reason we didn't convict her because we did not have enough evidence against her.
Final Conclusion-
Who did we narrow it down to?

In the end, we concluded that the murderer was Mr. Pulley. We have the most evidence against him- he is a male, his favorite subject is math, his handwriting matched the one in the planner, his bloodtype is the same as the murderer's (O+), his favorite candy is Reese's (and there was a Reese's wrapper at the crime scene), the red pen found at the crime scene is also the same one he uses all the time in class, his favorite band is the Beach Boys (and at the crime scene there was the word "boys" written in sand), and there was the letter J written on the meterstick at the crime scene and that is the letter his first name (Jonathan) Pulley starts with. Although we did have evidence that led us to maybe think it was someone else (like how Ms. Smith's handwriting matched or like the flour, salt, and the word recipe may have led us to Mr. Keith), Mr. Pulley is definitely the person we have the most evidence against, which is why we think he is the murderer.
Handwriting Vocabulary

Sample #
Anti. A
Anti. B
RH
Blood Type
1
No
No
Yes
O+
2
Yes
No
Yes
A+
3
Yes
No
Yes
A+
4
No
No
Yes
O+
5
Yes
No
Yes
A+

Graphology-
the study of handwriting and personality analysis based on handwriting
Baseline-
the line on which most letters rest. Imagine a line under this sentence-- that's the baseline.
X-height or midpoint-
the height of all letters that aren't ascenders or descenders. Remember when you were first learning how to write and you practiced on those sheets of paper with the dotted line in the middle? That's the x-height. Letters that don't go above the x-height are- a c e m n o r s u v w x z
ascender-
a letter that goes above the x-height. These letters are b d f h k l t and ALL capital letters.
descender-
a letter that goes below the baseline. These letters are g j p q y. The part that is under the baseline is caled the tail.
upstroke-
any movement made upward with the writing instrument
downstroke-
any movement made downward with the writing instrument
stem-
the vertical line in the letter (ex- B or T)
crossbar-
the horizontal line through the letter like in an A or F
counter-
the white space in an enclosed letter like in a P or O
flourish-
an ornamental stroke
hook-
a tiny flourish
to left or right in comparison to vertical angle
weight-
the thickness of the letter

-Using graphology, a handwriting analyst can tell the gender and the personality of the person that wrote it just by examining their handwriting.
- Although this is just a stereotype, in most English speaking countries "femenine" handwriting is usually neat, even, round, small, ornate, and symmetrical. "Masculine" handwriting tends to be described as hurried, sloppy, uneven, messy, and bold.
- Handwriting is affected by many physiological factors including handedness and age. Because children are sometimes still learning how to write, their writing may appear clumsy and messy until they fully master the skill. Older folks may have shaky hands or joint issues so their handwriting may appear shaky or trembly.
- Identical twins often times have very smiliar natural handwriting
- Everyone has a natural handwriting. This is the handwriting you naturally have, and it can be changed with practice and time. When someone is not using their natural handwriting to write, it is harder for handwriting analysts to use graphology to find out their personality.
Another note- The red pen used to write the note in the planner is the same one Mr. Pulley uses all the time in class, even when we were collecting evidence from him.
Fingerprinting vocabulary

Bifrications- when a ridge splits and turns into two ridges.

Dot- when there is two spaces on a ridge, the middle part is the dot.

Ridge Endings- when a ridge stops.

Arch- a fingerprint pattern in which the ridge pattern originates from one side of the print and leaves from the other side.

Core- a center of a loop or whorl

Delta- a triangular ridge pattern with ridges that go in different directions above and below a triangle

Fingerprint- an impression left on any surface that consists of patterns made by the ridges on a finger.

Latent Fingerprint- a hidden fingerprint made visible through the use of powders or other techniques.

Loop- a fingerprint pattern in which the ridge pattern flows inward and returns in the direction of the origin.

Minutiae- the combination of details in the shapes and positions of ridges in fingerprints that made each unique; also called ridge characteristics.

Patent Fingerprint- a visible fingerprint that happens when fingers with blood, ink, or some other substance on them touch a surface and transfer the pattern of their fingerprint to that surface.

Ridge Pattern- the recognizable pattern of the ridges found in the end joints of fingers that form lines on the surfaces of objects in a fingerprint. They fall into three categories: arches, loops, and whorls.

Whorl- a fingerprint pattern that resembles a bull’s-eye
Why do people leave fingerprints?

The sweat glands in the skin of your finger tips produce a water based oil solution that coats the ridges of your print. These ridges retain a portion of this solution such that when the finger makes contact with a surface, a residue is left behind which is a facsimile of your print (laten print).
The most incriminating print was found on the mirror because its definatly the murderers print.
Blood Typing Conclusion

When we blood typed our results lead us to a few people. They were Mr.Pulley, Mr.O, Mr.Johnson, and Mrs.Kasi.
Based on the results of the Blood Typing we can conclude that the blood type of the killer was O+. We can also conclude that our possible suspects are Mr.O, Mr.Johnson, Mr.Pulley and Mrs.Kasi. We can al;so conclude that the victims blood type was A+.
Blood typing
Full transcript