Private investigator services in Massachusetts are governed by the M.G.L. c. 147 §§ 22-30 (Private Detectives) and regulated by the Massachusetts State Police — Certification Unit. A state-level license is required to operate as a private investigator for compensation in Massachusetts.
Quick Facts: Massachusetts PI Licensing
| License required | Yes |
| Licensing authority | Massachusetts State Police — Certification Unit |
| Governing statute | M.G.L. c. 147 §§ 22-30 (Private Detectives) |
| Official license lookup | https://www.mass.gov/private-detective-and-watch-guard-license |
| Authority website | https://www.mass.gov/private-detective-and-watch-guard-license |
| Last reviewed | 2026-05-17 |
Verifying a PI's License in Massachusetts
Before retaining any private investigator in Massachusetts, verify the individual’s license is active and in good standing. The Massachusetts State Police — Certification Unit maintains a public license search at https://www.mass.gov/private-detective-and-watch-guard-license. Search by the individual’s name or company name; the record will show the license number, status, and any disciplinary history on file.
What This Means for Hiring
Massachusetts’s licensing requirement means the investigator you hire has, at minimum, completed the state’s training and background screening process. It does not guarantee competence on your specific case — surveillance, family-court, corporate, and skip-trace work each demand specialized experience. When evaluating a Massachusetts PI, ask about case-type specialization, evidentiary chain-of-custody process, and prior testimony in the jurisdiction where your matter is pending.
Reference: All 50 States + DC
For licensing requirements in other jurisdictions, see the full PI licensing reference map.