The Special Inquiries Division (SID) conducts criminal and administrative investigations of Postal Service executives as well as OIG and Postal Inspection Service personnel. SID also conducts workplace environment inquiries and whistleblower reprisal investigations.

Whistleblower Reprisal Activity

The Postal Service is not covered by the Whistleblower Protection Act but has its own policy governing whistleblower retaliation. The policy prohibits retaliation against an employee because the employee (or applicant for employment) disclosed information the employee reasonably believes concerns:

  • a violation of any rule, law or policy
  • a gross waste of funds, gross mismanagement, abuse of authority or a substantial and specific danger to public health or safety.


Generally, the misconduct is a violation of law, rule, or regulation, or a direct threat to public interest — fraud, health, safety violations, and corruption are a few examples. The employee must (1) reasonably believe his or her employer has committed a violation of some law, rule, or regulation; (2) testify or commence a legal proceeding on the legally protected matter; or (3) refuse to violate the law.

Whistleblower activity from October 2018 through September 2019 included 76 allegations received, 1 investigation initiated, and no investigations closed with no finding of retaliation or deferred to another adjudicative body.

Workplace Environment

The Workplace Environment unit reviews workplace environment and operational issues in postal facilities throughout the country. The OIG Hotline is the usual source for complaints, but occasionally members of Congress, the Postal Service Board of Governors, and Postal Service management will raise concerns or forward complaints appropriate for review. Topics range from sexual harassment and discrimination to workplace safety. Workplace Environment reviews are designed to identify systemic rather than individual issues and foster postal management efforts toward providing employees a stress- and adversity-free work environment.

The unit accepts complaints from any Postal Service employee, including OIG and Postal Inspection Service staff. Reviews may result in fact-finding reports to management or referral for specific suggested action, such as workplace climate assessments.