Farmers and steelers live twice as dangerously as police officers

There it is - America's most dangerous jobs in 2007:

Also note that police officers' most common cause of death on the job are car accidents, not confrontation with criminals. Police officers' rate of death by homicide - about 8 per 100,000 - is just slightly above the rate for the general population (6.2 per 100,000), and is lower than the rate for general male population (10.0 per 100,000) or male population ages 20-59 (about 11 per 100,000).