Um, no, DC doesn't have one of the highest rates of police shootings (flyer posted on traffic control box, 6th Street and Pennsylvania Avenue NW)
This style of flyer is posted pretty frequently across the city. There is no identification on the flyers of the group putting them up.
I took the photo, forgot about it, and then when uploading some photos today, looked up some data. While of course, one killing is too many, and DC has a fair amount of violent crime, which means it's more likely that there will be some police killings, according to the most recent data I could find, from the Mapping Police Violence website (2015 data), DC ranks 46th of the nation's 60 largest cities.
Is that "one of the highest rates"?
Probably not. It definitely is a misuse of data.