Part 4

Using all available evidences, we came up with a plausible scenario which may have led to the tragic event. The death of a female child (Tanya) in a park suggests that this could be a case of paedophilic abuse.  As paedophiles have the tendency to content their infatuation for pre-pubescent children, it is not surprising that the criminal may have chosen a setting where the presence of children is likely** – a park, in this case.

The Hartono father and son could have coincidentally observed this crime and perhaps may have attempted to rescue Tanya. As the paedophile tried to eradicate any living witnesses, he may have used a blunt weapon and blew several punches on the jaw in the midst of the fight. This corresponds to the blunt force injury and a broken jaw found.

For the remains of three victims to be left unnoticed in a public area connotes that they were probably buried. In addition, burying bodies in soil agrees to our previous assumption of a quickened decomposition process (4 months for Tanya instead of the average 1 year). The criminal may have used a shovel to bury the bodies, which tells us that the criminal has planned for this. This case is unlikely an accident.

[208 words]

**Watch the interview of Ms Jaycee Lee Dugard who survived a paedophilic abduction, rape and abuse for 18 years. From 23:57 to 24:34, a personal footage of the kidnapper, Phillip Craig Garrido, shows that he was pretending to play guitar in a children’s playground while his wife zooms in at children in the background (blurred to protect the children’s identity).

THE END

Part 3 Question 6

Question 6

Picture 1 and 2 shows two adult remains and along with DNA profiling evidences, we can deduce that they are father and son.

However, we can't identify which remain is older based on the photos, but we know that they are both at least 17 years old due to the presence of third molar. Thus, the remains most probably belong to Herman and Adi.

Picture 3 will then belong to Anya since the DNA profile matches the living sister, Tanya.
This is only true if both of them are monozygotic twins, meaning they originate from the same sperm and same ovum, and hence same genetic background.

Part 3 Question 5

Question 5

                          
Picture 1 : Based on the photos in part 2, this picture shows a skull of an adult. The dentition shows a third molar at quadrant 4. So, the victim's age would be at least 17 years old.

Picture 2 : A piece of broken jaw of an adult bearing the first, second and third mandibular molars is shown. We can safely assume that the tooth on the most right is a first molar because of the root bifurcation mesiodistally. Besides that, the three teeth also shows the characteristics of permanent molars. Moreover, pieces of jaw just found by Dr.Rudi may also belong to this victim.  This is because picture 1 and picture 3 showed complete jaws. 

Picture 3 : A normal corpse takes about 1 year to decay. However, the father of Anya only filed a report for a missing child only four months ago. 
The jaw showed presence of mixed dentition and the size of the jaw is also small.
Leading to a conclusion that it may be a child jaw of about 9 to 10 years old.

There are several factors that may speed up the rate of decomposition : 

1. In hot and low humidity environments, the corpse can be decomposed in one week.
2. Gender can affect amount of tissue lost. Females : 1 pound of tissue a day. Males : 3 pounds of tissue a day.
3. Exposure to air can speed up the decomposition of corpse. 
4. Insects can also speed up the rate of decomposition
5. Soil acidity can speed up the process with increasing acidity levels. 

We can then assume that picture 3 showed a rate of decomposition of about 4 to 5 months which matches the missing person report filed by the father. 

Part 3

Part III - MURDER MOST BRUTAL

A day later at the mortuary....

 “You called me in, doc? Asked Detective Dr. Suria as she come up to Dr. Rudi who was waiting for her. “Anything new developed?” “Well,” Dr. Rudi sighed, “Other than what I had told you earlier, nothing much really. I have taken some shots of the items. Here, have a look. There are other pieces of a jaw and I found some missing teeth too” 

“Missing teeth, did you say?” Dr Suria asked, excited about what she has heard. Anything additional will help her piece the puzzle together! 

Dr. Rudi shrugged, “Sorry Dr. Suria, with only this much of evidence, I can’t seem to be able to do much. But….you have the files of some of the possible victims, right?”

 “Ya lah….” Dr. Rudi replied. “Herman Hartono and his son, Adi Hartono who lived a few blocks away from here. Also, Anya Suriati and Tanya Rosilawati, a pair of 9-year old twin girls, whose father filed a missing person’s report of Anya four months ago” 

“OK, I think we can match the dental records of those people with these evidences,” said Dr. Suria. “Send me their records and any radiographs taken too.” 

Dr. Suria continued, “I have also processed for possible DNA profile and still waiting for a match in the system. Fingers crossed…we might be lucky!”  

Question 5 

Match the photos of the victims’ pieces of evidence, explaining your rationale for doing so. 

Question 6 

The DNA profile showed evidence for a father and son. In addition there was DNA profiling pattern that matched one living twin (Tanya Rosilawati). With this, match the evidence to these victims who were earlier filed for missing persons. Explain your rationale.

Question 4

Question 4

Other than examining the dental aspects provided as evidence, what other ways can the victim be identified?

Anthropology Forensics
Anthropology Forensics is the application of osteology in a crime scene and deals with bony remains to identify the victims. Microscopic studies of the bone fragments can help investigators estimate the age, gender, ethnicity and stature of a victim regardless of the size of the bones. For example, findings of osteoporosis may show that the victim is likely to be an aged female. 

Forensic Ballistics/Weaponry Ballistics
Ballistics is also a discipline in forensics which studies on weaponry, mainly firearms and bullets. The conditions of wounds would enable forensic teams to understand the nature of the weapon(s) used. Based on the concept that each weapon has its own unique toolmark, this helps investigators identify the firearm, bullet and cartridge cases. It is interesting because a simple bullet wound can tell why, how and where did the assaulter attack from.  

Criminal Profiling
This method relies on the principle that each criminal will have a certain signature style of executing their crimes. In other words, it is related to psychology forensics which studies the behaviour of criminals. Crimes prosecuted by the same suspected criminal may be analyzed to identify any similarities or repetitive patterns in the criminal's approach. Following the findings, investigators and psychologists work hand-in-hand to predict the criminal's next move. 

Stomach Contents
Following an autopsy of a recently deceased victim, contents inside the stomach may present with surprising findings. Since digestion may take up to 24 hours to complete, the condition of the contents may help in estimating the time of death. Furthermore, the content itself, may also tell if toxins or poisons were ingested purposefully or unintentionally- which will rule out if the deceased died of a homicide or suicide crime. 

Facial reconstruction

The skull provides clues to personal appearance. The brow ridge, the distance between the eye orbits, the shape of the nasal chamber, the shape and projection of the nasal bones, the chin's form, and the overall profile of the facial bones all determine facial features in life.

 In Vancouver, the police did a 3D facial reconstruction of a badly decomposed victim. This has further proven that this method is reliable and applicable in victim identification.

Reconstructed face of an ancient Athenian girl by scientists in Greece

Demonstration of muscles adding as part of skull reconstruction

Fingerprint

Ever since scientists discovered that every person's fingerprints are unique, and police officers realized this singularity could help them catch criminals, fingerprints have been an integral part of the law enforcement process.

Many fingerprints found at crime scenes are not visible. These latent fingerprints, which are often incomplete, are obtained in various ways:

1. Powder such as ninhydrin to dust the surface. The powder sticks to the oily substances on the print making the pattern visible. The print can then be photographed and lifted off the surface by using a tape to which the powder adheres.
2. Fumes of iodine or cyanoacry-late for porous materials such as paper. These fumes readily collect on the oils in the print pattern and can be photographed. 

3. Argon lasers for latent fingerprints. When illuminated by light from an argon laser, a latent print is often quite visible. Visibility under laser light can be enhanced by first dusting the print with a fluorescent fingerprint powder.

demonstration of extract fingerprints

Modern fingerprinting techniques can not only check millions of criminal records simultaneously, but can also match faces, backgrounds and other identifiable characteristics to each perpetrator.

Serology
Body fluids such as blood, semen, saliva, and sweat, all contain serum. Blood is the most common, well-known and perhaps most important evidence in the world of criminal justice today. Bloodstain patterns tell a lot about position and movement during the crime, who struck whom first, in what manner, and how many times.


DNA can be extracted from blood (if white blood cells which always contain a nucleus are present) according to the following steps:

1. Blood samples are collected from the victim, defendant, and crime scene

2. White blood cells are separated from red blood cells

3. DNA is extracted from the nuclei of white blood cells

4. A restrictive enzyme is used to cut fragments of the DNA strand
5. DNA fragments are put into a bed of gel with electrodes at either end
6. Electric current sorts DNA fragments by length
7. An absorbent blotter soaks up the imprint; it is radioactively treated, and an X-ray photograph (called an autoradiograph) is produced.

Gel Electrophoresis 

The gel with UV illumination, theethidium bromide stained DNA glows orange

Hair Analysis
Look at the cuticle and medulla.

  

The presence of hair on weapon can identify it as the weapon used in the crime. Analysts can use hair DNA to identify or eliminate suspects by comparison. Through hairs and keratin, a person's race and age can be estimated. Under microscopic analysis, we can tell which part did the hair originated from as well how whether it was pulled out or a natural phenomenon of hair fall.

Joints and Soft Tissue Analysis
Something surgically implanted in you by a surgeon will have a documented serial number on record. Originally intended to speed recall of defective devices and ensure patient safety, serial numbers are found on implants and prosthetic. This can be used to trace the medical records of the dead body.

Analyzing the feet

There are currently two main forms used for identification.  being from records kept by podiatrist while examining and treating. The second is marks left by objects they have come in contact with the foot like shoes and ground surfaces(footprints). Toe nails can be a way to find DNA also.

Skin

1. Body marks can be characteristic of an individual.
2. A scar can come from surgery, an accident, or assault. Scars such as severe acne during youth can leave scars that remain into adult life and may be a helpful identification tool.
3. A number of individuals have scars from common operations like appendix removal.
4. The dates of such operations should be in the person’s medical records and the medical examiner will try to relate this to the age of the scar. 
5. Blisters on the skin made after death don't contain fluid. Blisters obtained when alive contain protein (will solidify when heated in a test tube) but blisters obtained after death don't.
6. Ligature marks also appear during manual choke holds; this is when the assailant strangles the victim with his or her bare hands. These ligature marks can sometimes be in the exact shape of the fingers that have applied the force to the neck area and it may be possible to extract skin samples for DNA analysis at this time.

Bite Marks

Criminals seem to leave their bite impressions on the skin of their victims, especially in cases of rape, child abuse, and homicide. There are seven types of bite marks which can be classified:

1. hemorrhage - small bleeding spot 

2. abrasion - undamaging mark on skin

3. contusion - ruptured blood vessel, bruise

4. laceration - punctured or torn skin

5. incision - neat puncture of skin

6. avulsion - removal of skin

7. artifact - bitten-off piece of body 

Lung Analysis

Lungs can also be tested by putting them in water 

The extended lungs may sink in:

• Diseased
• In children, if they sink, the child is presumed to have been stillborn.
• Atelectasis 

Due to:
1. Non expansion of lungs due to feeble respiration

2. Complete absorption of air from lungs by blood, if circulation continued after stoppage of respiration

3. More air being expelled from lungs during expiration than what is inhaled

4. Obstruction by an alveolar duct membrane

Unexpanded lungs may float from :

• Purefactive gases of the putrefield lungs are soft and greenish. Signs of decomposition seen.
• Artificial inflation : The foetal lungs may be artificially inflated by blowing air through a tube, catheter or cannula passed into the trachea or by mouth-to-mouth method. 
• For children, if the lungs float, the child is presumed to have breathed.

• Additional facts!

	Identification Method	Chances of Failure
1	Comparison of Scalp hair	1 in 4500
2	Anthropometry (Bertillon’s method)	1 in 268 million
3	Teeth bite marks	1 in 2.5 billion
4	Dactylography(Fingerprints)	1 in 64 billion
5	DNA Fingerprinting	1 in 2 x 1022

Part 2 Question 5

Question 5

List the evidences presented to both the doctors.Considering the evidences up to this point, describe in detail how would you go about investigating further, assuming you are Dr Rudi or Dr Suria, explain what you anticipate at each step.

Since these evidences are found in the same vicinity, we can assume that they are related to the same case. Below are the evidences that are available to Dr. Rudi and Dr. Suria:

Evidence 1: Part of a large jaw bearing five teeth and a skull

Evidence 2: Complete jaw with some teeth still in eruption

Evidence 3: A piece of jaw bearing 3 posterior teeth

Hence, we can safely deduce that there are 3 victims in this case at least.

Below is an animation depicting a conversation between the forensics team, followed by a detailed transcript of the conversation.

Based on the dentition and size of the jaw, we can know whether the jaw belongs to an adult or a young child.

Carry out an orthopantomogram(OPG) to get radiography of the mandible. Therefore, we can know the estimated age of the victim by depending on the maturation of crowns and also transparency of roots.

By using forensic facial reconstruction, we can recreate the imaginary face of an individual either into two or three dimensional by using the skull and large jaw found.

Determine the radiocarbon content in tooth enamel by using radiocarbon-14 dating. Radiocarbon dating works on the principle that accumulation of carbon-14 by the body will stop upon death, and will decay at a fixed radioactive decay rate. Therefore, by knowing the carbon-14 content in the deceased and through calculations, the age and year of death of the victim can be estimated.

According to part 1, Dr. Rudi mentioned that there is ‘Blunt force on the back of the head’. By looking at the size and shape of the injury of the skull (as used in ballistics forensics), we can approximate the weapon used and try to find evidences of the weapon in the vicinity.

Lastly, by cross-checking the list of missing person in few months back, we can narrow down the scope to only a few suspected victims. Then we can interview their family to find out more information related to the case.