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If I’ve been fascinated by one scientific area that s forensic science.
What is it? What is forensic science all about?
“Forensic science can be simply defined as the application of science to the law. In criminal cases forensic scientists are often involved in the search for and examination of physical traces which might be useful for establishing or excluding an association between someone suspected of committing a crime and the scene of the crime or victim. Such traces commonly include blood and other body fluids, hairs, textile fibres from clothing etc, materials used in buildings such as paint and glass, footwear, tool and tyre marks, flammable substances used to start fires and so on. Sometimes the scientist will visit the scene itself to advice about likely sequence of events, any indicators as to who the perpetrator might be, and to join in the initial search for evidence. Other forensic scientists analyse suspected drugs of abuse, specimens from people thought to have taken them or to have been driving after drinking too much alcohol, or to have been poisoned. Yet others specialise in firearms, explosives, or documents whose authenticity is questioned.
In civil cases forensic scientists may become involved in some of the same sorts of examinations and analyses but directed to resolving disputes as to, for example, the cause of a fire or a road accident for which damages are being claimed.
Forensic scientists can appear for either side – prosecution or defence in criminal matters, and plaintiff or defendant in civil ones. They tend to present their findings and opinions in written form either as formal statements of evidence or reports. Sometimes they are required to attend court to give their evidence in person”.
Findings through forensic evidence…
Measuring Body Temperature
Although body temperature can vary between us as human beings, the average body temperature is around 37oC (or 98 Fahrenheit).
Measuring Temperature
Some people have varying temperatures as a result of variances in their metabolism: the higher the rate of metabolism the higher the temperature and likewise the lower the rate of metabolism the lower the body temperature.
The temperature will vary in certain areas of the human body as well. For example the temperature in the mouth will be 37oC (or 98 oC Fahrenheit) but underneath the armpit the temperature reading will be around 36.4 °C (97.6 °C Fahrenheit). Temperatures can also be taken using the tympanic method (from the ear).
By far the most accurate reading of a body temperature is the one that can be taken rectally. Although is not the most pleasant of ways in which to read someone’s temperature it is the most accurate in relation to the body’s core temperature and for this reason it is normally the most used method of determining the temperature of the decease when they are examined at the scene of a crime.
Blunt Force Trauma
Blunt force trauma is – as its name would suggest – a severe traumatic episode caused to the body or head with the sudden introduction of a blunt instrument used with great force. This can sometimes be caused by an attacker striking out at a victim with their hands, a large piece of wood, a baseball bat or other such item that would cause heavy damage to the body or skull if impacted against them quickly.
Blunt force trauma is something that is also experienced during a car accident, especially if the individuals involved are not wearing seatbelts and are catapulted forward at speed against the dashboard, steering wheel or indeed the rear of the driver and front passenger’s seats.
Blunt force trauma can also be inflicted without a great many visual indicators. A great number of individuals who die from this condition do so because of the internal injuries they have received, which may result in nothing more than some exterior bruising.
Identifying the Victim
When it comes to identifying the deceased forensic science and forensic medicine are both crucial weapons in any law enforcement agency’s armoury.
Difficulty in Identification
Identifying the victim can sometimes not be as simple as looking at their face and matching them to a description given by a worried relative or loved one. Sometimes there are extraneous forces at work, which make identifying the victim a long and laborious task.
The main reasons for difficulty in identifying the victim are:
- Massive head trauma
- Submergence in water for long periods of time
- Decapitation
- Disfigurement
All of these are of course grisly in their own right and the task of identifying a victim can be made much trickier if any of these issues arise.
Ligature Marks
Ligature marks are those marks made by an item of cord, rope, silk or some such material that has been used for the purposes of strangulation.
Ligature marks come in many different patterns and sizes and can be unique to certain fabrics and materials and this is why they are so important in criminal investigations that revolve around the strangling of a deceased individual.
Ligature Marks as Evidence
Normally strangulation is carried out by squeezing the area just about the Adam’s apple for a sustained period of time, thus crushing the windpipe and preventing the victim from being able to breathe.
Once the assailant has carried out this task it is normally only a matter of time before the victim dies if they haven’t already died during the strangulation.
Forensic scientists and Scene of Crime Officers (SOCO) will normally look for these ligature marks around the neck and will photograph them at the scene of the crime before the pathologist looks at them in more depth at the autopsy stage.
These ligature marks – as we have already mentioned – are made from the material used to strangle the victim and indeed are an imprint on the skin as a result of great force and pressure applied to them.
Ligature marks are normally dark brown in colour and have a red band on either side of these horizontal marks signifying the width of the item used to carry out strangulation.
The pathologist will also check the tongue and larynx of the victim post mortem as well as this indicates strangulation if these organs of the body are enlarged.
He or she will also look for signs of the carotid arteries being obstructed as well as damage being caused to the thyroid arteries. All of these prove useful and can tell a lot about the pressure and force applied by the perpetrator whilst strangling their victim.
New Ways to Detect Lies With Forensics
One of the most challenging tasks for a forensic expert is determining if a person is telling the truth. Over the years, all sorts of testing methods have been introduced – some eventually disregarded while others have become mainstays in forensic science.
New Techniques
In the past several years, however, new techniques have been brought forth, many promising to revolutionise the way in which we determine if a person is honest or telling a lie. In fact, a recent claim is that a new test is ninety-seven percent accurate in finding out if someone is telling lies.
Does It Work?
The test has, however, been approached with much scepticism and doubt. The technique is one that monitors the brain using functional magnetic resonance imaging (fMRI).
Researchers in support of the test claim that it is the gold standard for determining if a person is lying. Those who developed the technique cite that when a person is lying, there is an increase in blood flow to the brain. In turn, oxygen levels in the brain increase.
Some of the different disciplines of forensic science have become identified primarily with law enforcement, an image that has been enhanced more recently by television series such as CSI. This is misleading because forensic scientists are involved in all aspects of criminal and civil cases as well as among others, the family courts, immigration and employment tribunals and the results of their work may serve either the prosecution, defence or either side in a hearing as well as acting more recently as a single joint expert.
Forensic science and the work of the forensic scientist does have an impact on the number of cases entering our legal system by assisting the decision makers before a case reaches the court, as the facts developed by the forensic scientist are based on scientific investigation which may convince the prosecution team that the case does not merit a trial or the defence that a guilty plea is the correct one.
The forensic science investigation at times proves the existence of a crime or makes connections to other linked crimes, and the forensic scientist provides information and expert opinion to investigators, solicitors, judges and juries which helps in determining the guilt or innocence of the accused.
Continuity of the forensic science evidence is of paramount importance and there is a necessity for accurate record keeping at every stage in order that the chain of custody of the exhibits can be shown in order that the integrity of the forensic evidence is maintained at all times. To this end the time, date and location of the receipt or subsequent movement of any forensic science exhibit must be meticulously maintained from the moment of seizure to its delivery at the laboratory and movement within, and continued up to its presentation at court if required.
The forensic scientist must make sure that the examination is complete and the tests performed have been done correctly, the interpretation of the scientific data is thorough and that the written report is correct and easily understood by the layman, and finally that the evidence given is complete, unbiased and truthful, anything less is not acceptable.




