#dna

dna fingerprinting image

Harvest and Homicide – A case of DNA fingerprinting.

Yes, I know you are wondering how Forensic and Festival of Harvest known by different names in India can become a subject of matter for an interesting reading. Follow the true story behind these. Celebrating this harvest festival throughout the country, it may be interesting to recall one of the first cases solved with the aid of forensics and something akin to what we now call DNA fingerprinting. 
In the 13th century, a farmer’s corpse was found slashed in the paddy field of his village. In a time where evidences were a fairly new concept, investigators relied on experience and intuition. Sung T’zu, the physician and judge of the province started off examining this case by understanding what type of weapon caused the wound. To do this, he used an animal carcass to inflict lacerations and incisions with different weapons, eventually concluding that a sickle was responsible for the wound inflicted on the farmer’s corpse. Commonly, a tool used by other farmers and peasants. Unfortunately, the usual route of questioning and interrogation was fruitless, so the physician tried an alternate route. All the owners of sickles in the village were asked to line up and place their sickles on the ground, and voila! A few minutes later, one particular sickle attracted flies to itself. Leading to the apprehension and conviction of the assailant.
Now you may ask, how and why, did the jury acquit a person solely on the buzz of a few flies? Upon murdering the victim, the sickle used was only wiped, not cleaned of the blood. The remnant traces of blood and tissues on the blade attracted the hematophagous insects to it.Since then to this day and age, we have discovered plentiful clues to be analysed that aids the investigation. The study of insects attracted to blood and tissues, is referred to as Forensic Entomology. However, a more common tool utilized in nearly all cases is DNA Analysis. It is possible to establish identity of a person, link a perpetrator to the victim and crime scene, and considerably more, with the study of collected DNA samples.
The Biology branch in Truth labs often deals with cases where DNA is analysed to aid both Individuals, Investigative and Judiciary departments to identify, link and biologically profile people.As an ode to the harvest season and one of the first cases solved using intuitive forensics, our DNA team at Truth Labs, solved a similar case where the weapon of assault was used to confirm the link between the victim, assailant and the weapon. An investigative team approached Truth labs with a Bamboo stick and a piece of clothing requesting analysis on the blood and hair sample adhering to the same. After a thorough analysis, DNA profiles and markers of the victim were found an exact match with the samples obtained on the submitted articles. Therefore, providing concrete evidence to the investigators.
Truth labs accepts various samples such as clothing, body fluids and viscera, weapons and tools, and so forth to perform Biological and genetic analysis that aids with issues ranging from establishing identity, lineage analysis and DNA profiling etc.

The crimes may not have changed, but the science of analysis has.

Harvest and Homicide – A case of DNA fingerprinting. Read More »

dna fingerprint

DNA is Fireproof!

No one wants to be caught committing a crime! The crime can be something minor or something major. Culprits will try every possible way to escape blame, falsify their own identity and evade capture. In their need to safeguard themselves, neither their victims nor innocent bystanders will escape the malice of the perpetrators.  This is a case where a dna fingerprinting solution was carried out beyond the grave.

Arsonists and Murderers have no compassion for their victims. They only care about the endorphins released or personal satisfaction that they derive from the heinous act that they have committed. Only to hide their involvement, do they try to bamboozle the investigators by altering or destroying the crime scenes as well as the identity of their prey. They use various means to tamper with the evidence by either using weapons or hiding the evidence or corrupting the evidence using chemicals like acid/bleach or fuels like petrol/kerosene to set fire.

Everything that a flame touches, it destroys!

Burning is an effective tool to erase evidence like clothing, paper, fingerprints, electronic devices, etc. Nothing is fireproof, not even the human body. Fire is a very destructive force, capable of great damage. Burnt human parts can be found in a range of situations, from archaeological funerary urns, to aeroplane crashes, bomb blasts, to volcanic eruptions, as well as fire accidents (natural, accidental as well as intentional).

The human body is made up of soft and hard tissues, and fire will have a dramatic effect on both. Fire can be fatal in different ways, but the most common are either due to the heat or suffocation from the smoke produced.

The heat of the fire will cause significant damage to the body. The fire will cause the soft tissues to contract, which causes the skin to tear and the fat and muscles to shrink. The internal organs will also shrink. The muscles contract due to burning and this causes the joints to flex. The heat will also cause significant changes to the bone. The skeleton does not burn in a uniform way. Some bones will burn at a higher intensity than others due to factors such as body fat distribution, proximity to the heat source, etc. Quite often the peripheral bones of the hands and feet will not be burned to such a high intensity as those at the centre of the body, where most fat is located. Body fat acts as a source of fuel and people with more fat will burn at a higher intensity than very thin people.

Pathological evidence can also be observed in burned remains, including joint disease, or cut marks. This is useful for forensic contexts because perpetrators often think that burning a body will eliminate evidence of trauma (such as knife wounds or dismemberment), but this is not always the case. a DNA fingerprint can survive in the bone but it is often degraded.

To illuminate that DNA is ‘fireproof’, please see the below story.

In a desolate part of a town, some passersby noticed some foul smells, and noxious vapours emerging from near a brick wall. They lodged complaints with the police about the smell and fumes. Upon visiting, the police discovered that the burning smell and fumes were emerging from something resembling a funeral pyre. They managed to douse the flames and saw charred human remains. The remains were sent for postmortem, wherein the Autopsy Surgeon identified that the remains were of two females, one aged about 18-20 years and the other aged about 30-35 years. The police put out a brief bulletin, describing the clothing worn by the victims, along with their physical characteristics. Based on the bulletin, a middle-aged gentleman approached the police, claiming that the victims might be his sister and niece.

The police sent the partially burnt bone fragments and charred muscle pieces for DNA fingerprinting to Truth Labs, along with the blood sample of the middle-aged man. Truth Labs examined and analyzed the scorched samples, by re-suspending the overcooked muscles and could clearly establish that the elder victim was the middle-aged gentleman’s sister. We could also clearly establish that the two victims were mother and daughter. We could give closure and peace to this family.

DNA is Fireproof! Read More »

Scroll to Top