Three officers were involved in the police raid that ended with Breonna Taylor shot dead in her home in Kentucky. Only one of them has been charged, but not in relation to her death. Why are so few police officers charged after fatal shootings in the US? Brett Hankison faces three counts of "wanton endangerment" for firing into an adjacent apartment, putting Ms Taylor's neighbours at risk. The other two officers involved were not charged - despite one of them firing the fatal shot - because Ms Taylor's boyfriend fired first, mistaking them for intruders. It's a decision that has sparked some bewilderment and prompted hundreds to take to the streets of Louisville and elsewhere. But it's not the first time a fatal shooting by a police officer has made headlines but not made it to trial. The ones that do are a tiny fraction. In 2020 so far there have been 10 officers charged, according to Dr Phil Stinson, a professor at Bowling Green State University in Ohio and a former police officer, who has been collecting data on police prosecutions since 2005. The year with the most officers charged was 2015, when 18 law enforcement members faced murder or manslaughter charges. The Washington Post estimates police shoot and kill about 1,000 people each year in the US. Most of those incidents do not rise to the level of controversy or scrutiny seen in Ms Taylor's case, and may have occurred when the officers were themselves fired upon. But getting a charge or conviction for those tragedies that involve excessive use of police force is rare. These are the factors that explain why.