The Las Vegas Crime Lab is a scientific laboratory located in Las Vegas, Nevada, which uses primarily forensic science for the purpose of examining evidence from criminal cases while determining who is responsible for the crime that has been committed. Employees of the Crime Lab are known as criminalists; this includes both CSIs doing mostly field work and lab techs doing mostly lab work. CSIs are equipped with guns in the field, but are not considered police officers. CSIs often mention this to suspects to make them feel more comfortable.