Physical Science plays a great role in investigations



Physical Science plays a great role in investigations such as rape


Physical science plays a great role in investigations such as rape, traffic accidents, and murder. The DNA of a person has a physical bond relationship with a person and often can tell who the person is. Physical scientists use different types of sciences to determine the features, and the time of different crimes, examples are; botany, biology, chemistry and many others. Weather conditions such as rain, wind, heat and cold also contribute much to the scene of the crime.


In cases such as murder for example; if a body is left out in the scene of the crime during sunny seasons, it is likely to decay faster than if it was left out in a cold season or place, also, during rainy seasons, the evidence is more likely to be washed away. This is why physical science is, therefore, necessary to help one know and be able to identify the difference in the transmission of heat from, and of cold weather conditions.

Physical science is a general term that is used to define a field of study that applies science to problems that are defined by both civil and criminal law. Physical scientists work within a given range of framework provided by the investigators of a suspected legal violation and which are, of course, given and directed by the civil and criminal laws.

Similarly, criminal law is being seen as a subject to criminal justice, therefore the range of physical science is seen to be greater than that of criminal justice. As suggested by Myren Richard (1980) that the study of criminal justice should advisably be moved to justice in order to give criminal justice a wider scope as well. This was also meant to ensure that students enrolled to study criminal justice or crime-related fields should not only limit themselves to criminal justice but also civil justice,

Physical science experts have the responsibility of storing evidence from crime scenes however minute or unimportant they seem to be. They are required to analyze the evidence, scrutinize them and find out more information from them as they can, they are also required to classify the evidence, document the observations made and ensure that they are carefully handled and they are not tampered with.

Because of their unique kind of expertise, they are often summoned upon to court to provide lab related evidence or any scientific observations that are often related to the victims under trial.

Physical scientists’ main work involves the coordination between lawyers, law enforcement agencies, medical personnel and other related fields. Some forensic science experts are allowed to get to the scene of the crime while others mainly work in laboratories, mortuaries and hospitals.

Some of the scientific methods used by physical science experts in the criminal investigation include:

  • DNA(Deoxyribonucleic Acid)-This is a molecule that has information about all the genetic and biological composition of all human beings. The DNA samples are mostly used in crime scenes mainly for purposes of identifying the bodies and the samples can be obtained from the body tissues, hair and even blood.
  • Gunshots residues- Usually composed of unburnt and burnt material from the explosive primer, the propellant as well as the components from the bullet, the cartridge case and the firearm used. The physical science experts apply the GSR kits to the residues to determine the composition of the sediments in and try to relate it to the actual crime occurrence, for example; detection of a significant amount of residue is thus enough to prove or draw conclusions that the person was very close, or even holding the gun when it was discharged.
  • Fingerprinting- this is one of the most common types of scientific methods used by forensic scientists to identify the victims of the accident as well as the suspected criminals. The weapons that are found at the crime scene are likely to have the fingerprints and since every individual has unique fingerprints, its easy to identify and match the criminal.

The criminal justice system involves people and their interaction with the social norms and values that society recognizes and accepts. The problems that face a certain society are often noticeable when a criminal justice system is involved, and lawbreakers are punished. The criminal justice system may enable the interaction of people from diverse ethnicities and diverse religious backgrounds. Generally, if proper context and observation and context is made then a reason can be traced to every situation.


In the current world, forensic technology is advancing at a faster rate with new forms of technology to deal with criminal cases. More sophisticated and user-friendly programs and equipment have been developed to counter the old programs. This has also facilitated the collection of more detailed and accurate information and also the exchange of material between different criminal agent agencies.

Many countries have so far had a reduction in the criminal cases in recent years and this is attributed to the increased resolution of cases using fingerprints. For example; Canada has an AFIS( National Automated Fingerprint Identification System) that was created by the New South Wales police fingerprint system.


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