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2015 saw increased awareness of police-related deaths. Despite that, we have no definitive count of the number of people killed by police, or of police officers killed in the line of duty.
For example, the British newspaper The Guardian reported "1,134 deaths at the hands of law enforcement officers in 2015." That's over double the number of police-related deaths estimated by the FBI in 2015, according to a proposal out last month in the journal PLOS Medicine.
The lack of reliable numbers is worrying some public health experts who say that police-related deaths should be a matter of public health, and they want those deaths to be included in official counts.
Nancy Krieger, professor of social epidemiology at Harvard T.H. Chan School of Public Health.
This segment aired on January 4, 2016.