To become a forensic technician, you need to be free from any crime records or any criminal history. If you have, you will surely be rejected from the job and expectedly lose your career. If you decide to hide your criminal background in the past, employers will still be able to access that information through conducting several tests. These tests may include a background check, polygraph examination, physical examination, psychological evaluation and other mode of investigation to ensure that you have not committed any crime. Becoming a crime scene technician needs you to be skillful in the field. Those working inside laboratories need a scientist to work instead of technicians.