The New Jersey Department of Corrections has lifted a ban on a book that links racial discrimination and mass incarceration after the ACLU called the prohibition unconstitutional and demanded the department reverse its position.Inmates at the New Jersey State Prison in Trenton and Southern State Correctional Facility in Delmont were barred from reading Michelle Alexander's 2010 book, The New Jim Crow: Mass Incarceration in the Age of Colorblindness. The ACLU New Jersey chapter made the discovery as a result of a public records request.In a letterto the state's Department of Corrections on Monday the ACLU demanded the book be immediately removed from any lists of banned publications."Keeping a book that examines a national tragedy out of the hands of the people mired within it adds insult to injury," Amol Sinha, the state ACLU executive director, said in a statement.A few hours later department officials responded with a statement of their own saying the DOC had reversed the ban in the two facilities and stressed that there had never been a departmentwide ban on the book.It turns out the book is used in a college enrollment program for inmates run by the New Jersey Scholarship and Transformative Education in Prisons Consortium.Matthew Schuman, a spokesman for the New Jersey Department of Corrections, toldThe New York Times the ban was removed because "officials determined that the book should not have been banned, as evidenced by the fact that it is being utilized as a teaching tool for NJ-STEP students."In a statement, the Corrections Department said it is now reviewing its policy on banned materials "for appropriate revisions."A spokeswoman, Melanie Weiss, toldNBC News that until now, the decision to ban a publication was made on a facility-by-facility basis. She said she expected that to change.Inmates will now be allowed to challenge a facility's decision when a book is banned. Additionally, the department admitted that "policies and procedures governing inmate publications were not consistently enforced in the past." To correct that, it is enforcing mandatory annual staff training.Correctional facilities around the country regularly ban books, magazines and other reading materials for a variety of reasons, including book size, construction and content.But ACLU staff attorney Tess Borden, who drafted the letter to the New Jersey agency, argued the ban on The New Jim Crow not only violated the First Amendment but was especially egregious in the state with the worst black-to-white incarceration rate in the country.A 2016 reportby the Sentencing Project found New Jersey has the biggest gap between black and white incarceration rates of any state in the U.S. Black residents are put behind bars at 12 times the rate of white residents. Nationally, that disparity is closer to 5 to 1, the report found."For the state burdened with this systemic injustice to prohibit prisoners from reading a book about race and mass incarceration is ironic, misguided, and harmful. It's also unconstitutional," said Borden.And, Sinha added, "Michelle Alexander's book chronicles how people of color are not just locked in but locked out of civic life, and New Jersey has exiled them even further by banning this text specifically for them."In a 2012 interview on Fresh Air about the book and Alexander's work as a legal scholar, she told NPR: