Researchers found that among the eight states with the least gun ownership, there's a 13.5% average rate of police fatalities over those 14 years. However, there's a 52% average rate of police fatalities in the 23 states with the highest gun ownership.
Here's what that means, according to The Washington Post [ https://www.washingtonpost.com/news/wonk/wp/2016/07/08/more-police-officers-die-on-the-job-in-states-with-more-guns/ ]: "Line-of-duty homicide rates among police officers were more than three times higher in states with high gun ownership compared with the low gun-ownership states. Between 1996 and 2010, in other words, there were 0.31 officer fatalities for every 10,000 employed officers in low gun-ownership states. But there were 0.95 fatalities per 10,000 officers in the high gun-ownership states." That's a clear, statistical correlation between civilian gun ownership and police-officer fatalities.
The study found that police officers "working in states with higher levels of gun ownership faced a greater likelihood of being shot and killed on the job compared with their peers in states with lower gun ownership."