thePIdirectory is the world's oldest, largest and most comprehensive directory of private investigators, forensic examiners, scientific experts and other investigative specialists.

A wide range of investigators and specialists available!
Choose from an extensive range of investigative specialists, experts and services, including missing persons locators, surveillance operatives, undercover agents, polygraph examiners, fingerprint technicians, computer forensics specialists, DNA / paternity testing, handwriting analysis, drug screening, and other specialized fields.

Please click on the type of specialist or service you require from the icons below: