Local Orange County Private Investigators. Campbell Investigations is a local Orange County PI firm with local investigators. We specialize in "Private & Sensitive Issues" Investigations. Our confidential client list includes Private Parties, Businesses, Law Firms & Insurance Companies. Campbell Investigations provides service to all Southern California areas. Our services range from surveillance and undercover operations to witness statements and AOE/COE Investigations. All investigative matters are completely confidential and never discussed outside our firm. Our professional investigative team consists of former law enforcement officers, industry trained expert investigators & claims specialists. Campbell Investigations is state licensed (California PI # 19761) and fully insured. Visit our website for more information.