What is the origin of DNA evidence in crime scenes?

A criminal always leaves DNA in the crime scene, and recovering evidence such as fingerprints and DNA is the most interesting thing about crime scenes and crime scene investigators. Forensic investigators can recreate a crime scene using evidence and crime simulation programs.

id people and crime scenes

Police use DNA evidence to run tests and find out who committed a crime.

Identification, for people and crime scenes.

Yea, it is used for several different tests. For example we have DNA testing for paternity tests to confirm the babies father also we use DNA tests in crime scenes to help find the criminal in a specific crime. Yea, it is used for several different tests. For example we have DNA testing for paternity tests to confirm the babies father also we use DNA tests in crime scenes to help find the criminal in a specific crime.

you need many copies of DNA for DNA fingerprinting

Because DNA evidence isn't always available, DNA being there doesn't mean they did it, et cetera.

CSI (the actual investigations, not the show) are used to investigate crime scenes. These investigations gather evidence such as fingerprints, DNA evidence, matching of witness to apparent events that people use in a courtroom to convict or prove innocent the accused persons.

No, hair is not interchangeably used to describe DNA. However, hair is a source for DNA this is why when forensic scientists are involved in crime scenes, they look for any sample of which contains DNA, including hair.

Police use DNA from crime scenes to identify criminals or victims Doctors and scientists use DNA to identify genetic diseases

To gain evidence on a crime. You gather fingerprints which can help determine their DNA so you can find the criminal

They compare the DNA of those found at the scene of the crime against any suspect. This can be achieved by using Electrophoresis.

National Commission on the Future of DNA Evidence

One example is that of DNA technology used in investigating crime scenes.

To compare suspected parental DNA to offsprings to determine if they are the true parent or not and for crime scenes to determine who was the real culprit.

because if there is no crime scene we cant recognise where the crime occurs we'll also not able to find any evidence and any dna sample

Blood evidence can help to identify the suspect who comitted the crime, (especially in regard to their unique DNA which is found in the blood).

DNS evidence is valuable because it can make a determination of who committed a crime without leaving room for error.

The Combined DNA Index System makes available DNA profiles collected through various federal, state and local government agencies for comparison with crime scene evidence.

The DNA of each individual is unique. No two individuals share the same genetic make up unless they are identical twins. Analyzing DNA samples found at a crime scene can help place a suspect at the crime scene. If it can be legally proven that a suspect was present at a crime scene, there is practically no refutation to this finding. DNA test data is very valuable in court. But if you were never at the scene of the crime how can they prove you were anyone could have put it there?

There are a few downsides to DNA evidence: It has been suggested that the prominence of DNA evidence on TV shows has caused juries to expect irrefutable DNA evidence before convicting someone. This may be a problem if other forms of evidence are ignored. DNA evidence can only be obtained in instances where biological substances are left behind or exchanged. This only occurs in a minority of cases. DNA evidence sometimes only proves that the person was present at the scene - it does not always prove guilt. However, if a person's DNA is found at the scene, this may be perceived as proof that they committed the crime.

All police officers are trained in the preservation of evidence at a crime scene, but unless they are specifically trained as crime scene or evidence technicians the average police officer is merely aware of DNA testing, not any specifics as to how it is conducted.

DNA has many uses in real life. These uses may include use as evidence in a crime scene for example

DNA is only narrowly applicable in identifying an INDIVIDUAL who may or may not have been involved in an offense. Older methods of crime detection, evidence collection and identification are still WIDELY USED. DNA is useless in identifying such things as tire track impressions - paint chips from cars - ballistics - fingerprints - and in so many more areas that they cannot possibly be included here.

While criminals have used many means and tried many chemicals to destroy evidence, today, scientists can easily locate enough forensic evidence at most crime scenes. Fire (arson) and bleach have been two commonly used measures, but science can identify inflammatory agents and bleach does not remove all blood evidence. It only takes one tiny blood cell to track DNA. The BEST way to completely eliminate forensic evidence is to never commit the crime!