He's probably referring to "Kids For Cash" [0].
> racial bias in sentences
You can look at federal and state incarceration statistics for yourself. African-Americans and Hispanic-Americans serve, on average, longer sentences for the same crimes as their Caucasian counterparts. Here's one source.[1]
> jail for marijuana
Mandatory minimums for possession (especially "with intent to sell") have been part of federal drug enforcement policy for the last 50 years. Here are a few of them.[2]
> private prison etc
It was only this year that the DOJ finally committed to eliminating private prisons in the federal system.[3] They're still a massive part of state penitentiary systems (see: cash for kids).
[0]: https://en.wikipedia.org/wiki/Kids_for_cash_scandal
[1]: https://www.aclu.org/issues/mass-incarceration/racial-dispar...
[2]: http://www.pbs.org/wgbh/pages/frontline/shows/snitch/primer/
[3]: https://www.justice.gov/opa/blog/phasing-out-our-use-private...