Johnny Gibbs has been trying to get a valid driver’s license for 20 years, but he just can’t afford it.

To punish him for high school truancy in 1999, Tennessee officials told him he would not be able to legally drive until he turned 21. He drove anyway, incurring two tickets and racking up more than $1,000 in fines and fees.

Like other low-income defendants in similar situations across the country, Gibbs couldn’t pay and ended up serving jail time and probation. That incurred another cost: a monthly supervision fee to a private probation company.

Rather than risk another arrest, Gibbs, now 38, decided to quit driving, which he said makes it nearly impossible to work. He said he spent several years living in a motel room with his mother, his disabled father and his sister before they all became homeless. In August, the family found housing in a dilapidated trailer, miles from the nearest town or food source.

A growing number of legal groups and nonprofit organizations throughout the U.S. are challenging these practices, but they continue ? despite a 1983 U.S. Supreme Court decision that found it unconstitutional to incarcerate defendants too poor to pay fines.

In Oklahoma, for example, the Washington-based Civil Rights Corps, which has litigated more than 20 lawsuits since it was founded in 2016 to undo various aspects of “user-funded justice,” is challenging policies that it claims have led to one of the highest incarceration rates in the world.

Counties across the state of Oklahoma refer debt collection to a for-profit company, Aberdeen Enterprizes II, which adds an additional 30 percent fee and threatens debtors with arrest. Many of those who can’t pay are not just thrown in jail; they’re also made to pay for their incarceration, further increasing their debt.

Tennessee Supreme Court Justice Jeffrey Bivens said reforming fees, fines and bail is a priority of the Conference of Chief Justices, a nonprofit organization comprising top judicial officials from each of the 50 states.