If/when Trump follows through on his promises to deport millions of undocumented immigrants, they will be funneled through ICE's "removal" apparatus, the detention facilities for which are contracted out to private prison groups.

These facilities are already inhumane. They are also incredibly underprepared to adequately treat any mental health problems that any of these millions of people may have.

Inside the deadly 2012 private prison riot in Natchez, Miss—scant medical supplies, rank food, and a nearly entirely English-speaking staff for a correspondingly Spanish-speaking population. The riot prompted the Department of Justice's initial report recommending the agency end its relationship with for-profit detention.

Related: A DoJ Inspector General report on the Natchez facility published this month found "deeply concern[ing]… significant deficiencies in correctional and health services and Spanish-speaking staffing" at the CoreCivic (until recently CCA) prison.

A state judge in Texas ordered hundreds of women and children freed from a CoreCivic (formerly known as CCA)-run ICE "family detention" facility.

DHS's Advisory Board rejected a portion of an internal report that recommended maintaining and increasing ICE's reliance on private prisons—which sounds great in headlines, but their rejection is merely advisory, and Trump's DHS pick can just ignore whatever decision current DHS head Jeh Johnson makes anyway.

The pro-privatization and anti-regulation Trump presidency will be good news for not only private prisons but also the major banks—including Wells Fargo, Bank of America, and JPMorgan Chase—that finance the industry and profit off its reliance on debt financing.

The second-largest private prison company in America, GEO Group, made a potentially illegal $100,000 donation last week to a Super PAC supporting—shocker—Donald Trump.

Corrections Corporation of America, the largest and worst private prison operator in the country, is rebranding to the "social studies textbook"-sounding CoreCivic as it expands into jail construction and maintenance.

Even when prison systems outsource specific parts of their procedures to private companies, instead of whole facilities, it doesn't end well. Case in point: Corizon, the country's largest medical "health care" provider for jails and prisons, whose inadequate care has resulted in deaths and unnecessary complications from illnesses.

With the Department of Homeland Security now in the position of being private prisons' last federal sugar daddy—CCA got a secret, no-bid $1 billion contract to build and run the country's largest family detention center from ICE earlier this year—what can it do to ratchet down its increasing reliance on the industry? Luckily the ACLU has a helpful white paper that lays out what steps it should take:

1. End family detention and detention of asylum seekers (reducing detention population by 11,000-15,000 people)
2. End prolonged detention without bond hearings (reduction of 4,500+ people)
3. Interpret the mandatory custody statute to permit a range of custodial options, and apply it only to immigrants recently convicted of serious crimes who do not have meritorious immigration cases (reduction of 5,000-10,000 people)
4. Stop imposing exorbitant, unaffordable bonds (reduction of 1,300+ people)

There are obstacles, though: an anonymous ICE official told the Journal last month that ending ICE's use of private prisons would require an 800 percent expansion of the agency's capacity.