Crash Investigators, also known as Accident Reconstructionists, are professionals who use scientific methods to analyze the causes of motor vehicle accidents. They use their expertise in physics, engineering, and mathematics to reconstruct the events that led to the crash, and to determine the speed and direction of the vehicles involved. They also use computer simulations to recreate the accident scene and to analyze the data collected from the scene. Crash Investigators are often employed by law enforcement agencies, insurance companies, and legal firms. The job title 'Techs' is an abbreviation for Technicians, which is a common job title for Crash Investigators.