(a) whether the Government is aware that witnesses in criminal cases are either killed or threatened in a large number of dangerous criminal cases due to which courts had to finally quash such cases in various courts of the country;
(b) if so, the number of such persons killed during the last three years and the number of cases in which accused were set free due to adverse attitude of the witnesses during the said period;
(c) whether the Government proposes to make a law for security of witnesses in dangerous cirminal cases; and
(d) if so, the time by which it is likely to be done and if not, the reasons therefor?