A career spent establishing facts about other people teaches a handful of things that hold regardless of whether the case is a corporate fraud, a missing person or a marriage.
1. The Client's First Account Is Never Complete
Not from dishonesty — from embarrassment, from the natural editing everyone does, and from not knowing what matters. The detail withheld in the first meeting is frequently the one the case turns on, which is why the second conversation matters more than the first.
2. The Obvious Explanation Is Usually Right
Elaborate theories are appealing and rarely correct. When someone's money is disappearing, it is almost always the person with access to it. Exhaust the simple explanation before building the complicated one.
3. Documentation Beats Recollection, Always
Memory is confident and unreliable in equal measure. Contemporaneous notes made a decade ago have decided cases that no witness could recall clearly. Write it down as it happens, every time.
4. Most People Want to Talk
The hardest part of an interview is not extracting information — it is listening long enough. People tell you a great deal if you stop filling the silence.
5. The Answer Rarely Delivers What Was Expected
Clients imagine confirmation will bring relief. It brings clarity, which is genuinely valuable and entirely different. Preparing people for that gap is part of the job.
6. Turning Down Work Builds the Practice
The cases declined — because the client needs a lawyer, because the request is unlawful, because nothing useful can be found — generate more referrals than the ones accepted. People remember being told the truth at their own expense.
7. Every Discipline Reinforces the Others
Polygraph training sharpened interviewing. Gemology imposed rigour about verifying claims against instruments rather than assertions. Firearms instruction improved the ability to teach anything under pressure. None of it was planned that way; all of it compounded.
8. Small Errors Destroy Big Cases
A mislabelled file, an unsigned log, a date recorded from memory. Cases are almost never lost on the central question. They are lost on the housekeeping.
9. Discretion Is Structural, Not Verbal
Anyone can promise confidentiality. It is delivered through how files are stored, who is staffed, how reports are transmitted and how the office is physically arranged. Ask a firm how it works rather than whether it is promised.
10. The Work Is About People
Records, cameras and instruments are tools. What actually resolves matters is understanding why people do what they do — and that has not changed in 36 years, in any of the three countries where this practice operates.
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Dan Ribacoff is a licensed private investigator and the founder of International Investigative Group, a certified polygraph examiner, certified firearms instructor, GIA Graduate Gemologist and the author of I, Spy: How to Be Your Own Private Investigator. He works from offices in New York, Boca Raton and London, and has appeared as a polygraph expert on American and British television.