Under direction of the Chief Investigator, the Supervising Welfare Fraud Investigator oversees and conducts complex administrative, civil, and criminal investigations on behalf of the Department of Human Services. This position supervises investigative staff while ensuring compliance with applicable laws, policies, and investigative standards. As a sworn peace officer, the Supervising Welfare Fraud Investigator applies comprehensive knowledge of legal standards related to detentions, searches, arrests, and courtroom procedures, including providing sworn testimony and depositions. The incumbent is responsible for directing and participating in investigative activities that may lead to criminal prosecution. This position requires the physical ability to perform the essential duties of a peace officer, including making arrests when necessary. Incumbents must be prepared to use reasonable and escalating force in accordance with law and departmental policy. Essential Duties and Functions: According to Civil Service Commission Rule 109, the duties specified below are representative of the range of duties assigned to this job class and are not intended to be an inclusive list; may include additional duties as assigned. Oversees and conducts a variety of civil, criminal, and administrative investigations on behalf of the Department of Human Services by interviewing witnesses, key subjects, and experts and collecting, preserving, and analyzing evidence in order to understand the facts and how to proceed in a case. Oversees and directs the use of confidential data systems e.g. the California Law Enforcement Telecommunications System (CLETS), Department of Motor Vehicles computer system, credit reporting systems, Incomes and Eligibility Benefits Transfer (EBT) and welfare systems. Oversees and conducts investigations into suspected criminal negotiation of certain types of welfare warrants to determine whether or not fraud has occurred. Prepares specialized administrative and investigative reports in different formats for executive staff, Investigations Manager, and other departments. Prepares evidence for presentation in criminal courts and administrative hearings. Assists in the development of unit and Departmental policies specifically related to law enforcement including arrest techniques, officer safety protocols, and use of force. Evaluates Department policies and procedures for possible fraud opportunity and/or security weaknesses and makes recommendations to DHS Executive Staff on resolution. Reviews and assigns investigative referrals regarding welfare fraud, administrative claims against the City of San Francisco, child deaths, alleged criminal conduct by Department employees, and threats against employees. Trains, evaluates, and supervises professional investigative staff in conducting warrant investigations and other investigative activities. Oversees the work of the assigned Investigations Unit checking for completeness and the application of appropriate investigative methods in arriving at conclusions, findings, and recommendations. Acts for the Chief Investigator in case of absence in all routine matters and special matters as assigned. Acts as a liaison between the Department of Human Services and other criminal justice agencies in order to facilitate and coordinate investigations. Makes criminal arrests, detentions, and assuring proper cause and using physical force when necessary, using an appropriate escalation of force options. Executes search warrants. Provides superiors with adequate demonstration of minimum standards for requested detentions, arrests and search warrants. Uses vigorous safety precautions in handling and properly maintaining firearm(s); tests semi-annually for firearms or verification and maintains passing scores. Facilitates regular training related to the use of force, firearms use and qualification, law enforcement standards for searches, detentions, and arrests, and other specialized peace officer duties. Operates motor vehicles in order to accomplish timely investigations, transport witnesses and suspects, deliver criminal evidence and court exhibits.