Traffic Enforcement and Motor Vehicle Law
What this domain tests
Traffic Enforcement and Motor Vehicle Law tests stops, citations, impaired driving, and roadside procedures under the General Laws, especially c. 90 and c. 89. Expect questions on when a civil infraction becomes a criminal complaint and how to handle refusal and towing.
Core rules
- A traffic stop must be based on reasonable suspicion of a violation; the stop must remain reasonably related in scope and duration.
- Civil motor vehicle infractions are cited under G.L. c. 90C. The citation must ordinarily be issued at the time and place of the violation; exceptions are narrow.
- OUI is G.L. c. 90, § 24. The per se limit is 0.08; for drivers under 21 it is 0.02.
- Implied consent means a refusal to submit to a breath test triggers a license suspension, not a criminal charge for the refusal itself.
- An exit order requires reasonable suspicion of danger; a routine traffic stop does not automatically justify removing the driver.
- Inventory searches of towed vehicles must follow standardized department policy.
Worked example
An officer stops a car for a defective brake light. The driver has slurred speech, glassy eyes, and an open beer can in the console. The officer develops probable cause for OUI, arrests, and requests a breath test under implied consent. If the driver refuses, the officer documents the refusal and serves the suspension notice; the refusal is not charged as a separate crime. The car is towed and inventoried under policy.
Traps
Mailing a citation weeks later without a recognized exception; ordering everyone out of the car on every stop; treating a breath-test refusal as a criminal offense; and searching a towed car without following inventory policy.