Speaking of statistics. Deadspin is taking on a pretty ambitious project with regards to police shootings in the last three years (I think). They are in the list compiling stage now using multiple databases and FOIA requests. The long and tedious part will be the fact checking and vetting of sources. Should be worth a revisit if they pull it off.
http://regressing.deadspin.com/were-compiling-every-police-involved-shooting-in-americ-1624180387
http://regressing.deadspin.com/were-compiling-every-police-involved-shooting-in-americ-1624180387