A Black person is 3.5 times more likely to be wrongfully convicted of sexual assault, 7 times more likely to be wrongfully convicted of murder, and twelve times more likely to be wrongfully convicted of drug possession.
https://www.law.umich.edu/special/exoneration/Pages/Race-and-Wrongful-Convictions.aspx
With the advent of social media and smartphones, all of us can now see how often police lie. It's pretty much constant. Perjury, lying under oath, obstruction of justice, and being an accessory after the fact, pretty much don't count if you're a cop.