When the Bombay High Court on July 21 declared 12 prisoners not guilty after the bench found the prosecution had “utterly failed” to prove their involvement in the 2006 Mumbai suburban train serial blasts for which five of them had been sentenced to death and seven to life imprisonment in 2015, 40-year-old Mumbai resident Chirag Chauhan could feel his old wounds reopen after the same two decades the accused had spent in prison until acquittal.