The definition of “safety-sensitive position” is one that requires a significant degree of care and safety to perform and can cause direct and immediate danger to an employee or another person’s safety if it’s done by somebody who’s impaired. Typical examples include airline pilots, bus drivers, operators of heavy equipment, workers in mines and other dangerous work environments, etc.
Teachers would NOT ordinarily be thought of as safety-sensitive but COULD BE CONSIDERED such in unusual cases where they are assigned special safety responsibilities–instead of simply teaching behind a desk, they’re driving a school van or assigned responsibility for students’ safety during a class trip in which students may be exposed to some kind of danger like maybe a prison, mine or other industrial workplace.