The last time was last week.
Police in Louisville, Kentucky, Thursday released the body camera footage of a white officer shooting Bruce Lamont…www.rawstory.com
I am not sure how to prove or disprove what you are saying. You may be right: police shootings have only recently been on the national radar, within the last 5 years. There’s just not a lot of data we could use to establish trends. But frankly, my sense was that this issue has been very bad for a long time, and that people did not feel safe enough to orchestrate the kind of activism and outcry we have seen in the last few years, until Obama was in office.
Trump campaigned on his willingness to treat #blacklivesmatter activists like terrorists.