The duty of a Crime Scene Investigator is to examine the scene in such detail that he or she can uncover evidence and clues. Crime Scene Investigators must be both patient and meticulous. It is not unusual for a Crime Scene Investigator to spend hours on a serious crime scene. The Crime Scene Investigator will take photos, measurements, and thorough notes at the scene. He or she will also process the scene for latent (hidden) fingerprints and collect any relevant evidence. When the Crime Scene Investigator collects evidence, he or she is responsible for booking it into evidence, assuring the chain of custody remains intact, and for testifying about the evidence at trial.