Dash cams are legal in Massachusetts but regulated to ensure driver visibility and privacy, especially for audio under all-party consent rules. Mounting on the windshield is prohibited if it obstructs the view, per CMR 540 CMR 4.00 and traffic laws.
Mounting Requirements
Dash cams must not impair the driver’s line of sight or cover non-transparent areas on windshields, side windows, or rear glass. Preferred spots include the dashboard or behind the rearview mirror.
Side window mounts are allowed if they reflect ≤35% visible light. Improper setups risk tickets for obstructed view and inadmissible footage in court.
Audio Recording Rules
Massachusetts is an all-party consent state under the Wiretap Act (M.G.L. c. 272 §99)—secret audio of private conversations is a felony (up to 5 years/$10,000 fine). Notify all passengers verbally or via signs before recording audio.
Video of public roads is fine, as no privacy expectation exists.
Privacy and Private Property
No recording on private property without permission (e.g., driveways, lots). Footage from public spaces holds up in insurance claims or court if properly mounted.
Fleet and Commercial Use
Businesses must inform employees/passengers; signage suffices for compliance. Airbag deployment shouldn’t be hindered.
Evidence and Benefits
Compliant footage proves fault in accidents, aids insurance, and supports claims—chain of custody matters for admissibility. Police body cams set precedent for reliability.
Practical Tips
- Use suction mounts low on dash.
- Disable audio or post “Dash Cam Recording” signs.
- Check local PD for side window compliance.
- Update firmware for cloud backups.
SOURCES:
- https://www.expertmarket.com/dash-cams/dash-cam-laws-by-state
- https://legalclarity.org/are-dash-cameras-legal-in-massachusetts/
