How to Hire a Private Detective in New Jersey

New Jersey licensing at a glance

New Jersey licenses private detective businesses through the Private Detective Unit of the New Jersey State Police.

Step by step: hiring in New Jersey

1. Define your question. What do you need to know, and what decision depends on it?
2. Verify licensing. Look the detective up on the New Jersey State Police, Private Detective Unit website rather than relying on a license number shown in an ad. Confirm the license is active and check the agency license as well as the individual's where both exist.
3. Agree on scope and cost in writing. Know what will be done, for how long, and what you'll receive.
4. Share what you know. Names, addresses, photos, vehicles and schedules save billable hours.
5. Insist on lawful methods. New Jersey generally allows a participant to record a conversation (one-party consent), unless it's done with criminal or tortious intent. Detectives shouldn't hack accounts, pretext for records, trespass or track phones.

What affects the cost of an investigation in New Jersey

New Jersey spans 21 counties. Surveillance in a dense area like Newark may call for two detectives to keep a subject in view, while work in rural counties can involve more travel time. Records research that requires courthouse visits in several counties takes longer than searches available online.

Most surveillance is billed hourly plus expenses such as mileage; defined research tasks are often flat-fee. Our cost guide explains pricing in detail.

Questions to ask a New Jersey detective

• Are you licensed for work in New Jersey, and who will actually do the work?
• How often do you handle matters like mine in New Jersey?
• How do you handle recording and tracking under New Jersey law?
• Which county courts or records will you need, and how long will that take?
• What will the report include, and could you testify if needed?

More questions are in our list of 15 questions to ask before hiring.

Where we coordinate work in New Jersey

Mooney & Boland coordinates investigations throughout New Jersey, including Newark, Jersey City, Paterson, Elizabeth and Trenton. See private detective services in New Jersey for coverage and services.

Local pages for New Jersey communities:

Common questions

Sources

• New Jersey State Police, Private Detective Unit (official regulator)
• Justia: Recording Phone Calls and Conversations, 50-State Survey

Reviewed November 2026.