Not necessarily DNA match could mean the person was there before but it does not necessarily mean they were part of the crime
In almost all cases, no. You would not be guilty, but if you saw what happened, you are a witness.Another View: The above is true only if you were truly an un-involved witness who just happened to be at the scene when the crime went down.HOWEVER - if you were there accompanying the person or persons who committed the offense, YES - you could be charged as an accessory.
Police and other crime investigation workers can take DNA from the scene of the murder (or other crime) and check it with databases of other DNA samples and match it to a person(s) and then they have their suspect(s).
They are known as crime scene investigator/examiner, crime scene photographer, crime photographer.
To the best of my knowledge the professional person who investigates a crime where it was perpetrated is called "a crime on scene investigator".
A piece of fingernail found at the crime scene
Yes, there is the primary crime scene and the secondary crime scene. For example, if a body was found in a trash can but there is no evidence that the person was killed there then it means the person was killed somewhere else. The primary crime scene is where the person was killed and the secondary crime scene is where the body was dumped.
recover it from a person or crime scene
in my idea detective or police officer are responsible in crime i mean the role of a detective is so important, he goes to the crime scene,searches foe the clues and evidences,talks to the witnesses and finally he can say who ia guilty?
Forensic investigators use genetic markers that vary from person to person. Thus, if all of the genetic markers in the DNA from a crime scene are identical to the genetic markers in the DNA from one of the suspects, that is good evidence that the suspect and crime scene DNA came from the same individual.
They are called the Coroner.
Genetic fingerprinting can match a hair to an individual person. It's now a common method of crime detection, if the root of the hair is with the hair. DNA can be extracted from the root.
DNA evidence found at the crime scene can be compared to the suspect's DNA to determine if there is a match, providing a strong link between the suspect and the crime scene. Other evidence such as fingerprints, footprints, or personal belongings left at the scene can also help link a suspect to a crime. Eyewitness testimony or surveillance footage placing the suspect at the scene can further establish their connection.