Conducts complex criminal investigations; interprets complex information; frequently makes decisions without consulting a supervisor; exercises extensive independent judgment and takes appropriate action with limited opportunity to evaluate alternatives; obtains and executes search and arrest warrants; as directed, supervises subordinates while they are conducting investigations, surveillances, interviews, interrogations and crime scene processing; ability to work effectively over a prolonged period of time; ability to maintain confidentiality of information and to restrict the use of such information. Lead investigator on all major criminal matters and lengthy investigations; ability to effect forcible arrests of violators; ability to communicate with witnesses and complainants in an effective manner; conducts skillful interviews/interrogations of suspects, prisoners, complainants and witnesses to obtain information beneficial to the investigation and the apprehension and conviction of offenders; prepares investigative and activity reports, maintains records and responds to correspondence.