While "disappeared" is a provocative (and inaccurate, from a South American perspective) headline, and while playing games shuffling arrestees between precincts is a very old one (check out any detective fiction from the 30s and 40s), this is still pretty darned bad.
And it's pretty clearly an intentional effort by the Chicago PD to bypass the 5th and 6th Amendments to the Constitution by sequestering folk detained for questioning or under arrest from their attorneys and the outside world, leaning on them to get confessions or to become informants, then failing to properly record information about the bookings during or after.
The question being, of course, will anyone do anything about it? Or will the electorate decide it's just "those people" who are being arrested and treated this way, and therefore it's nothing to worry about?
Homan Square revealed: how Chicago police ‘disappeared’ 7,000 people
Exclusive: Lawsuit exposes scale of detention at off-the-books interrogation warehouse while attorneys describe find-your-client chase ‘from a Bond movie’
Police states are very safe, as long as you're not one those people.
Next question will be how long before a police department thinks it can disappear people for reals.
Also, this bit from the artical economy is pretty much spot on.
"16. It’s best to think of the police as a sort of occupying army and avoid them accordingly – particularly if you are not white."
http://www.theguardian.com/commentisfree/2015/oct/08/america-guide-englishman-new-york