The title comes from a closing comment in 'Life of a Police Officer: Medically and Psychologically Ruinous' in The Atlantic:http://m.theatlantic.com/health/arch...uinous/284324/

In 2012, an unprecedented study of 464 police officers, published in the International Journal of Emergency Mental Health linked officers’ stress with increased levels of sleep disorders, Hodgkin's lymphoma, brain cancer, heart disease, diabetes, and suicide.

Other studies have found that between 7 and 19 percent of active duty police have PTSD, while MRIs of police officers’ brains have found a connection between experiencing trauma and a reduction in areas that play roles in emotional and cognitive decision-making, memory, fear, and stress regulation.
For once, on a quick scan, the comments have some value.