Maranda Lynn ODonnell, a 22-year-old single mother in Harris County, Tex., was arrested last year for driving without a valid license. The judge set her bail at $2,500. She couldn’t afford anything close to that, so she spent three days in jail — even though she posed no risk of skipping town or endangering anyone if she were released.
“In our society,” the Supreme Court has held, “liberty is the norm, and detention prior to trial or without trial is the carefully limited exception.” Yet across America, poor people like Ms. ODonnell are held in jail for days, weeks or even

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