Missing Persons Private Investigative Services Person location services Private investigators might use background checks, witness questioning or other investigative techniques to identify suspects or individuals who can help locate the missing person. Missing Persons Private Investigative Services Private investigators might use background checks, witness questioning or other investigative techniques to identify suspects or individuals who can help locate the missing person. Skip Tracing Skip Tracing is the process of finding and tracking down persons who might be able to provide information about an investigation. Skip tracing often includes more than just uncovering a simple location or contact data, like phone numbers/email addresses; it could also include requests for interviews with these individuals as well!