DNA Evidence

After 60 year old Horace Roberts was released in California prison this month he killed his former girlfriend and colleagues in 1998 and confirmed DNA evidence is invalid.

DNA evidence is an important element in identifying, prosecuting and convicted criminals, but the validity of DNA evidence is the root of the biggest obstacle. Since DNA evidence has been proved to be a useful tool for the investigation and prosecution of sexual offenses, gathering such evidence is a standard procedure for law enforcement agencies across the country. Today, 50 states and federal governments all collect DNA from perpetrators of certain crimes. More and more states are expanding laws for collecting DNA from people convicted of specific felony charges, and in some cases arrested or condemned by some misconduct. In addition, you can collect evidence of DNA directly from crime scenes and forensic investigations of sexual violence.

Police authorities and prosecutors will quickly judge the advantages of DNA evidence on the criminal justice system. They believe that some evidence of DNA is even more useful than fingerprints, and there are some points that are superior to traditional research tools. In a criminal investigation, DNA evidence is easier to obtain than a clear fingerprint because body fluids and hair are likely to remain on the crime scene. Evidence of DNA is also "firm", that is, it will not decay or disappear over time. In the years after crime, DNA can be confirmed with physical evidence such as hair.

That's why DNA evidence is very useful in research - it is nearly impossible for others to have the same DNA as you. However, as this article shows, using DNA evidence to capture offenders is not as easy as 'CSI'. The first step in investigating DNA evidence is the crime scene and biometric evidence gathered by detectives.

DNA evidence value DNA is a powerful investigation tool because no one has the same DNA except for twins. Therefore, the evidence of DNA collected from crime scenes can be linked to suspects and eliminate suspicion of suspects. For example, during sexual assault, biological evidence of hair, skin cells, semen, blood, etc. may remain in the body of the victim or other parts of the crime scene. You can compare correctly collected DNA with known samples and place the suspect on the crime scene. Furthermore, if you do not have a suspect, enter the DNA profile of the crime scene evidence into FBI's Joint DNA Index System (CODIS) to identify suspects from anywhere in the United States, link successive crimes I can.