“Sen. John Cornyn recalls visiting a Texas prison where some inmates taking shop classes could not read tape measures. Cornyn, who was previously a district court judge and Texas Supreme Court justice, knows that prisons are trying to teach literacy and vocations, trying to cope with the mental illnesses of many inmates and trying to take prophylactic measures to prevent drug-related recidivism by people imprisoned for drug offenses. ‘The criminal-justice system,’ he says, ‘has become by default a social services provider.’”