“No one should be kept in jail solely because he can’t afford to post bail. ‘Innocent until proven guilty”: It’s the bedrock ideal of the American justice system, a maxim familiar to every second-grader in the country. But as grown-ups, we know that the truth is more complicated. Every day in America, 400,000 people sit behind bars in local jails around the country, not yet convicted of any crime. They’re innocent under the law, but in practice deprived of their liberty — jailed because they cannot afford the money bail set by a judge.”