Of the roughly 7,400 people sitting in Philadelphia's jails right now, more than half of them aren't there because they've been found guilty of a crime.
They've been accused of one and are waiting for trial. Many of them just can't afford to pay bail.
That's what happened to Joshua Glenn.
When he was 16 years old, Glenn was arrested for allegedly shooting another guy in the arm — a crime he says he didn't commit.