A second OUI in Massachusetts is generally classified as a misdemeanor.
Jail: 30 days – 2.5 years (house of correction); mandatory min 30 days (14-day inpatient treatment program may substitute)
Fine: $600–$10,000 (plus assessments/fees)
License suspension: 2 years; hardship: after 1 year, interlock required
Ignition interlock: Required
Alternative disposition: If the prior OUI is >10 years old, courts may allow a second-chance 24D disposition (Cahill).
Interlock required for 2 years after reinstatement (2+ offenses, c.90 § 24 1/2).
Lookback period: lifetime. Melanie's Law (2005) imposed a lifetime lookback — all prior OUIs count regardless of age. A prior >10 years old can restore eligibility for a second-chance 24D-style disposition ('Cahill' disposition) at the court's discretion.
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