Step 4b: Take the police detective test or get professionally certified (timeline varies)

There is a wealth of certifications available for both police detectives and private investigators.

For those who have several years of investigative experience in law enforcement, they may qualify to take the National Detective/Investigative Test (NDIT) which measures a police officer’s readiness to become a detective or investigator. This 75-question exam measures candidates’ knowledge in criminal investigations, major court cases, and investigative interviewing.

Similarly, the Police Detective (PDET) 200 Series provides a 100-question test gauging law enforcement professionals’ knowledge in police investigative procedures, laws related to police work, and how to complete reports. There are also professional certifications available to detectives and PIs outside of police forces.

For investigators who specialize in negligence or criminal defense investigation, the National Association of Legal Investigators (NALI) offers the certified legal investigator (CLI) certification. CLI candidates must have at least five years of full-time experience (or qualifying academic coursework); complete a 1,000-word research paper on investigations; and pass an examination with a score of at least 70 percent. To maintain the certification, CLIs must complete 50 hours of continuing education (CE) every three years.

For investigators who specialize in security, ASIS International offers the professional certified investigator (PCI) certification. To qualify, candidates must have a high school diploma and five years of investigative experience (with two years in case management). The 140-question exam tests people’s knowledge in case management, investigative techniques & procedures, and case presentation.