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Nationally endorsed. We are the Official PI School in the U.S. PITI is rated by experts as the #1 top online program in the certification of private investigators. We are the recruiters’ choice.Top credentials. With PITI staff, you can be confident that you’re learning from the best and most experienced instructors from the field. DTI has offered over 24 years of unsurpassed excellence in professional training. The most successful graduates. More PITI graduates are employed as private investigators — or have started their own PI agencies — than any other PI school’s graduates. Why? PITIplaces a high premium on setting high standards in instructional design that delivers the most effective training. Armed with the latest cutting-edge investigative techniques and business skills, you too will succeed with PITI!