Forensic Science Interesting Facts

1). Do you know that Forensic Science was not invented by investigators? They were invented by Cops, police officers who just felt that ancient methods were too inefficient to follow.

2).  Fingerprints aren't foolproof, although everyone would think that there isn't two people with the same fingerprints. Forensic Scientists say that its very difficult to find a matching fingerprint although computer analysing has made it much easier.

3). DNA testing isn't foolproof either, although the chance is extremely low, sometimes, the precise testing can cause mistakes.

4). Deleted files on the computer aren't always gone, Forensic Scientists or Investigators would be able to develope softwares to rewrite these deleted files.

5). Everything you do on the internet is tracked. Well, its scary, but the government can do that! Every click, everything you type, every website, the government can track even when im typing now. This applies to criminals who are released on bail.

6). TV policemen always get to use their guns at nearly every case they are called on to investigate?

No, The average police officer in the city of New York, America would have to work for approximately sixty years just to be able to shoot once.

7). Pigs are the closest analog to the human body. Forensic scientists use pigs to study decomposition of the human body as well as tool markings.

8). Most professionals agree that if a person knows that they are telling a lie, it can be detected by the polygraph. The polygraph measures the physiological arousal that occurs when people lie. Thus, the theory goes, a person could only “beat” the test if they are telling a lie that they believe to be the truth. Polygraphs are admissible in court if the judge allows the evidence.

Thank you very much for reading this post. Hope you like it:)

Forensic Science Reflections

Forensic Science Reflections


Well, forensic Science has been an enriching and interesting topic for me, it has 
covered things which i had not known before. For example, the fingerprinting, the different methods to solve crimes, through various exercises, I have learnt more about forensic science and how to apply it in our daily lives. Also, it has given me more skills on how to use Excel, to plot a graph with easily transparent shortcuts, and surprisingly, after i found our all these special features in Excel, on that day, i rushed home and started experimenting with what i had learnt. Also, studying Fingerprints closely and analyzing led me realize how much focusing and long attention span a forensic scientist needs to have. Last but not least, this module adds on new facts which we do not know such as the golden ratio. In conclusion, i truly appreciate the school setting up a new science topic different from the usual boring and standalone topics. Also, the use of videos have greatly enhanced the course. I hope that the school can have more of such modules for me to analyse different aspects of science. 

(Newspaper Article on Forensic Science) New Way to Analyze a Bloody Crime Scene: Chicken Wing Sauce and Trigonometry Brought to Bear On CSI Enigma

WSU physicist Fred Gittes, left, and doctoral candidate Chris Varney used a "clapper" to spray simulated blood and develop a crime-scene investigation method of pinpointing the height a liquid comes from. (Credit: Washington State University photo)

But then a scientist with forensics training told him that crime scene investigators could use a better way to analyze blood spatters. The physicist in Gittes rose to the challenge.

"It seems as though what was being done was very crude from a physics point of view and that intrigued me," he says.

Along with Chris Varney, a doctoral candidate in physics, Gittes has worked out a system that can often determine exactly where blood spatters originate, a critical piece of evidence in not only solving a crime but securing a conviction. A paper on their research, demurely titled "Locating the Source of Projectile Fluid Droplets," has now been accepted for publication in theAmerican Journal of Physics and posted online.

Until now, investigators have been able to determine the direction a drop of blood has come from, with a stain's elliptical shape practically pointing to it. They've even been able to nail down a source along a vertical line. But the tougher part is figuring out how high up the source was.

"I talked informally with a public defender and he said that it's crucial to know the height because so often it's a self-defense issue," Gittes says. "A defendant may claim that a victim was standing rather than sitting. That's a big deal, apparently."

Gittes and Varney started tackling the problem with a clapper -- two boards on a hinge that could be clapped over a liquid, producing a spatter from a known and measurable height and angle. To get a liquid with blood-like impact shapes, they tinkered with corn syrup, food coloring and a variety of sauces before settling on a blend of Ashanti chicken wing sauce and Ivory dish soap.

Most of the math they used is at about the level of first-semester college physics. We'll spare you most of it, except to say they worked back from measurements of known spatters and sources and found that well known equations of projectile motion could be used to develop a formula giving them the height of a liquid's origin.

They also realized that, plotted on a graph with x and y axes, data points on specific drops form a neat line when the formula is working correctly. If drops are launched from too wide a range of angles, the method won't work and the data points won't line up, preventing investigators from making a false conclusion.

Gittes says he is chiefly interested in the new approach as a teaching tool, and a WSU geologist has expressed an interest in using similar methods to study lava fountains and volcanic debris. Gittes says he is content to leave any forensic application to crime scene investigators. Besides, he is way too squeamish.

Reflection:

In a crime scene, Forensic Scientists will always look for Fingerprints. Second in the list is A blood splatter. A blood spatter contains DNA evidence of a person but the collection process is always very difficult. So now, Scientists have developed a way to make that process faster and more accurate. Also, scientists need to know where blood splatters originate to determine where the victim was killed or where the murderer had went etc. Well, everyone would think that the location could be determined by the blood stains but the other critical matter is the height. A defender can claim that the victim was standing instead of sitting. Well, now, scientists are using Corn Syrup, food colouring or even sauces to determine the location of the blood splatter! This method has just been released by researchers and needs more time to develop and for it to be implemented. But as in most cases, they would be disadvantages and in this case, if drops are launched from too wide a range of angles, the method won't work and the data points won't line up, preventing investigators from making a false conclusion. Let us just hope that Forensic Science becomes more and more universal and for everyone to appreciate it, and to develop more science to nab criminals and murderers easily!:)

Graded Activity 3: Skeleton measurements and the case of the middle aged woman

Below is the chart of Simon's Dimensions:

Below is the chart of my Dimensions:

Possible Reasons for discrepancies:
-Measuring tape was not able to pinpoint the exact location of the parts well.
-We did not take the average as it was only measured once.
-Height Differences during night and morning whereby we would supposedly be taller in the night than in the morning.
-Genetic differences.

Whether my body satisfy Golden Ratio?
Golden Ratio: 1.618
My Head to Naval: 62cm
My Naval to feet: 100cm
My Golden Ratio: 1.612
Difference to the real golden ratio: 0.006

Age of woman: 70 years old ( 2011 – 1940 – 1)
Height of the middle-aged woman+working:
Height of females are: 2.352×length of Tibia = 74.775
SO: Theoretical Height of Middle Aged Woman= 2.352 ×33.5cm + 74.775cm = 153.567cm (Answer)
Actual height after subtracting (Height decreases by 0.06cm per year after 30 years): 153.567 – (0.06 x 40) = 151.167 cm


Adjustments to the estimated time of death:
a). If the body is found unclothed, it will cool and decompose faster than a clothed body. However, since it is summer in August in Australia, the temperature is higher and speeds up decomposition too. Thus, overall, the body will decompose faster.

b). If the body is found lightly clothed, they body will similarly cool faster and decompose faster than a fully clothed one but slower than a unclothed one. Also, since the electric heater is giving out heat and thus will overall make decomposition even faster dramatically with the hot weather.

Here, i concluded the 3rd activity of the Forensic Science Topic. (Skeletal Measurements and Estimation of time of death) Look out for more posts on Forensic Science!:)

Pie Chart of Graph of Fingerprints 1A1

The following is the pie chart of the fingerprints of the teenagers in Class 1A1.

Conclusions
Well, This graph clearly shows that loops actually overwhelm the others in this fingerprint test in Class 1A1, this is somewhat correct to the theoretical proportions. However, all 10 of my fingers are whorls except for the last which is a composite. This is somewhat unbelievable as Whorls are supposed to take up only 35 % and loops are 65%. It is surprising that i do not even have a loop! Also, the proportions of the different types of fingerprints are rather similar to the theoretical proportions although the number of arches is far more than the predicted. This can be due to the human error induced during the experiment and not having examined our fingers closely enough due to the lack of time and advanced equipment.

Thank you for viewing. This is a graded assignment for Forensic Science.
Ye Jiadong 1A1

Lefty Lewis Forensic Science

Evidence that may have been left at the scene of crime:
-HIs 78 Holden tyre tracks in the mud
-Oil that leaked out shows path of his car
-shoe prints
-small trickle of blood
-Torch which fell out
-fingerprints everywhere (not wearing gloves)
-Back mudguard which scraped onto the gate
-footprints in the house

Evidence that may have been taken away by Lefty:
-His car, which would have pointed out the owner of the car which was Lefty
-Soil, dirt, pollen on Lefty's shirt and pants
-Jewellery stolen by him
-the "cased joint" which erased some evidence
-His jemmy and balaclava and his gloves in the car which had his fingerprints on them

Suggestions for the forensic scientist
-Firstly, to conduct a fingerprint test in the house, on the torch, on the window and all around the house.
-Second, take note of all the shoeprints in the house and outside and also footprints and compare based in database and find the matching person.
- Make out Lefty's car trails and find the path which he took home and also from the oil which leaked all the way.
-Find matching blood samples based on the blood collected from the scene.

Forensic Science Avatar Creating

This is the avatar of Josh Groban, a very pro singer.

The real Josh Groban. Compare.

This is the avatar of me:)