Washington · Revised Code of Washington — Title 46, Motor Vehicles
RCW Title 46 § 46.37.390: Mufflers required—Smoke and air contaminant standards—Definitions—Penalty, exception
What this law says, in plain English
Motor vehicles must have functioning mufflers and cannot exceed smoke/opacity emission standards or operate with amplified exhaust noise. Courts may dismiss infraction notices if reasonable grounds exist the vehicle wasn't operated in violation.
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