The responsibilities of the Office of the Inspector General include:

The OIG investigates allegations of misconduct by City of Baltimore employees and contractors, which may involve violations of criminal law, civil statutes, City of Baltimore regulations, or employee standards of conduct. Reports also include findings and recommendations regarding program weaknesses, contracting irregularities, and other institutional problems that are discovered as a result of the investigations initiated by the OIG.

"Baltimore City Inspector General Isabel Mercedes Cumming outlines the responsibilities and mission of the office."
Check out the full Baltimore Sun article (Broadwater, 2018) 

Principles and Standards

The OIG has adopted the Investigative Principles and Standards for an Office of Inspector General— also known as the Green Book—established by the Association of Inspectors General (AIG). The AIG, organized on October 26, 1996, is a national, non-profit membership organization for agencies and professionals in the inspector general community. The AIG promotes excellence in the inspector general community by establishing and encouraging adherence to office-wide and discipline-specific quality standards.