How to Hire a Private Detective in Massachusetts

Massachusetts licensing at a glance

Massachusetts licenses private detectives through the Massachusetts State Police.

Step by step: hiring in Massachusetts

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 Massachusetts State Police, Certification 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. Massachusetts generally requires the consent of all parties to record a conversation, and secret recording is a felony. Detectives shouldn't hack accounts, pretext for records, trespass or track phones.

What affects the cost of an investigation in Massachusetts

Massachusetts spans 14 counties. Surveillance in a dense area like Boston 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 Massachusetts detective

• Are you licensed for work in Massachusetts, and who will actually do the work?
• How often do you handle matters like mine in Massachusetts?
• How do you handle recording and tracking under Massachusetts 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 Massachusetts

Mooney & Boland coordinates investigations throughout Massachusetts, including Boston, Worcester, Springfield, Cambridge and Lowell. See private detective services in Massachusetts for coverage and services.

Local pages for Massachusetts communities:

Common questions

Sources

• Massachusetts State Police, Certification Unit (official regulator)
• Justia: Recording Phone Calls and Conversations, 50-State Survey

Reviewed November 2026.