Welcome to McGrath Investigative Services: Personalized, Professional and Custom-Tailored Investigative Services. When choosing a private investigator, it is important to know who will actually be working on your case. Most agencies use apprentices, who are inexperienced, unlicensed, and their results will often reflect that lack of experience. At McGrath Investigative Services, your case will be handled by an experienced, licensed, professional investigator with a minimum of 10 years of full time field experience. David McGrath will provide you with a free consultation, and create a custom approach to best suit your specific needs. David has successfully worked over nine thousand cases, and has acquired the experience and knowledge crucial to obtain the documentation and information you seek. Please take a moment to browse our site, and do not hesitate to call with any questions you may have. All agencies claim to be the best, so please take the time to decide which agency is right for you.