[driftdiver]

Here is one of the studies. Do a search on ‘police abuse of force’ and you’ll find a lot of info.

http://www.ncjrs.gov/pdffiles1/nij/181312.pdf

“more than two-thirds (67.4 percent) reported
that police officers who report incidents
of misconduct are likely to be
given a “cold shoulder” by fellow
officers, and a majority (52.4 percent)
agreed or strongly agreed that it is not
unusual for police officers to “turn a
blind eye” to other officers’ improper
conduct”

Another interesting factoid, 15% of excessive force claims are made against less than 1 percent of the officers.

[Hulka]

Interesting, but irrelevant, as what you cite does not address/prove your allegation that a “DOJ study found that when force is used by cops it is most often used inappropriately.”

You said DOJ backed you up (federal cops, no less), so, please cite the relevant section.