Before this summer, screening was done by BOP chaplains. They culled material sent to the libraries and pulled mostly hate literature – a lot of it white supremacist citing a Christian basis – that could endanger prison security.
The new policy instead uses religious experts to select a list of approved materials. The list is long, allowing up to 450 titles for each of 20 religions or religious groupings, and will be periodically updated. But many titles that the BOP admits “may be very worthwhile” aren’t on the list and were removed from chapel libraries.