Clinical investigations done through DNA testing or genetic testing can solve multiple investigative cases that have been put in cold storage because of the leads going cold. Criminal investigations have become easier because DNA testing has paved the way for fair investigation and accurate identification of criminal, ensuring that the criminal justice system provides justice to all equally.
The following ways ensure how DNA testing helps criminal investigation in crime scenes.
Narrowing on the suspect:
In the many cases, the scene of crime can be misleading, i.e. a murder scene could be portrayed as a break and entering gone wrong. In these cases, the DNA testing of any suspicious body parts such as hair which the victim has pulled to run away from the criminal, skin which the victim has peeled out during the struggle or even blood when the survivor has injured the criminal in defence. A simple DNA test can identify the criminal and if he already has a crime sheet, then it is easy for the investigating officers to put him under radar and order his arrest.
Identifying the victim:
A survivor, who has just been taken into the hospital from a crime scene but has no identity on him, can be easily identified through DNA testing. Even if the victim is not from the same country, his medical history such as disorders or any specific disease such as diabeties can be found through DNA testing. It will help the emergency doctor operate the patient with care and set up the necessary medical treatment based on the patient’s medical history.
Ruling out suspects:
DNA tests help the officers narrow down on their suspect through the process of elimination. Any crime scene will have a possible list of suspects. For example, a 32-year old man’s murder investigation could lead to suspects such as his wife, colleague, family member, rival, scorned girl friend or even loan sharks. The only way to identify the criminal is to rule out the suspects. DNA testing of all the suspects will enable the officers to rule out those, whose DNA does not match with the evidence found at the crime scene. This allows the investigating officers do justice to their jobs. In addition, it also ensures that an innocent person is not mistaken as the criminal, which would be the greatest injustice and defeat the purpose of criminal investigations.
In the courtroom, criminal cases need hard evidence so that no innocent person is punished by mistake. Submitting the DNA test of the criminal is treated as proof enough to convict him. For example, a serial rapist would has been careless would have left enough evidence on his victims. If his DNA is matched with the many of the women he has raped, then it is shown as evidence to seal his conviction. Similarly, if a hard core murderer leaves his DNA behind at the crime scene, then it is enough to get a warrant against him and put the whole department into action to capture him.