Non-disclosure of taxpayer information: disclosure barred except by law; no feedback to informants, grievances to PDIT(Inv.). Non-disclosure of taxpayer information is required: the department gives no feedback to informants; disclosure of specific taxpayer information is prohibited except under limited statutory exceptions, directorates of investigation are exempt from RTI obligations under the Second Schedule, and informants may seek grievance redressal from the PDIT (Inv.).