Section 20. Tanodbayan's Immunities. —

1. No proceeding, opinion or expression of the Tanodbayan or any member of his staff, shall be reviewable in any court;

2. No civil action shall lie against the Tanodbayan or any member of his staff for anything done or said or omitted, in discharging the responsibilities contemplated by this Decree;

3. Neither the Tanodbayan nor any member of his staff shall be required to testify or produce evidence in any judicial, legislative or administrative proceeding concerning matters within his official cognizance, except in a proceeding brought to enforce this Decree.