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Yes. It is legal to hire a licensed private investigator to follow and observe someone in Massachusetts and New Hampshire — as long as the surveillance happens in places open to public view and the investigator stays inside the law. Watching someone’s movements on public streets, in parking lots, or in businesses is lawful. Secretly…

Most licensed private investigators in New Hampshire and Massachusetts bill by the hour against a retainer, and a typical case ends up costing somewhere between a few hundred and a few thousand dollars. Surveillance-based cases — infidelity, workers’ comp, custody — commonly run $800 to $3,000 depending on how many hours of fieldwork the case…