(a) When the Investigations and Fraud Management Unit of the Office of the Inspector General, which is charged with investigating welfare fraud and intra-agency employee misconduct, has credible information that indicates a person has engaged in an act or activity related to the Department of Human Services, the Department of Health, or the Department of Health Facilities programs, benefits, or intra-agency employee misconduct which is subject to prosecution, it may conduct an investigation to determine if the act has been committed. To the extent necessary to the investigation, the Inspector General or an employee of the Office of the Inspector General may administer oaths or affirmations and issue subpoenas for witnesses and documents relevant to the investigation, including information concerning the existence, description, nature, custody, condition, and location of any book, record, documents or other tangible thing, and the identity and location of persons having knowledge of relevant facts or any matter reasonably calculated to lead to the discovery of admissible evidence.When the Investigations and Fraud Management Unit has probable cause to believe that a person has engaged in an act or activity which is subject to prosecution relating to the Department of Human Services, the Department of Health, or the Department of Health Facilities programs, benefits, or intra-agency employee misconduct, the Inspector General or an employee of the Office of the Inspector General may request search warrants and present and swear or affirm criminal complaints.