Pope Francis will meet more than 100 men and women from a dangerously overcrowded prison population. Some 80% of those inmates at that prison, [Philadelphia's] Curran-Fromhold Correctional Facility (CFCF), have not yet been convicted of the crime with which they were charged. Most of them are behind bars because they have not paid or cannot afford to pay bail while awaiting trial. Francis has visited prisons in multiple countries. This particular prison ... presents an extreme microcosm of two of the most pressing national prison problems: pretrial detention and overcrowding. The prison system - particularly in holding those who cannot afford to pay bail - targets the very people Pope Francis has shown the most concern for: the poor. With 2.2 million people incarcerated mostly in state prisons and jails like Philadelphia's, the US now ... spends about $80bn on prisons. At any given time, between 400,000 to 500,000 of those people [are] held in pretrial or midtrial detention, sometimes for weeks, months and even years, usually because they cannot afford to pay bail. The Justice Department estimates that two-thirds of those inmates are non-dangerous defendants.