Firefighters usually must have at least a high school diploma, but some have a postsecondary degree in fire science or a related discipline. Most firefighters must pass written and physical tests, complete a series of interviews, and hold an emergency medical technician (EMT) certification. All firefighters receive extensive training after being hired. Applicants for firefighter jobs typically must be at least 18 years old and have a valid driverâ€™s license. They must also pass a medical exam and drug screening to be hired. After being hired, firefighters may be monitored on a random basis for drug use.