A crime scene investigator (CSI) is responsible for securing and examining details left at the scene of a crime. They are responsible for sorting through evidence and details to assist prosecutors in building a case. This person must be precise and meticulous, as protocols must be followed in a detailed and organized fashion. Tasks performed include lifting and collecting fingerprints, collecting and documenting trace evidence of DNA, determining time and cause of death in homicides, examining weapons and devices, and documenting each detail of various forms of evidence, among others. Crime scene investigators must possess the ability to remove themselves from the situation emotionally and analyze each detail objectively. This person must be able to think critically and analytically, as oversights can be highly detrimental.