(1) A person is guilty of unlawful possession of a loaded rifle or shotgun in a motor vehicle, as defined in RCW 46.04.320, or upon an off-road vehicle, as defined in RCW 46.04.365, if:

(a) The person carries, transports, conveys, possesses, or controls a rifle or shotgun in a motor vehicle, or upon an off-road vehicle, except as allowed by department rule; and

(b) The rifle or shotgun contains shells or cartridges in the magazine or chamber, or is a muzzle-loading firearm that is loaded and capped or primed.

(2) A person is guilty of unlawful use of a loaded firearm if:

(a) The person negligently discharges a firearm from, across, or along the maintained portion of a public highway; or

(b) The person discharges a firearm from within a moving motor vehicle or from upon a moving off-road vehicle.

(3) Unlawful possession of a loaded rifle or shotgun in a motor vehicle or upon an off-road vehicle, and unlawful use of a loaded firearm are misdemeanors.

(4) This section does not apply if the person:

(a) Is a law enforcement officer who is authorized to carry a firearm and is on duty within the officer's respective jurisdiction;

(b) Has been granted a disability designation as provided by RCW 77.32.237 and complies with all rules of the department concerning hunting by persons with disabilities; or

(c) Discharges the rifle or shotgun from upon a nonmoving motor vehicle, as long as the engine is turned off and the motor vehicle is not parked on or beside the maintained portion of a public road, except as authorized by the commission by rule. This subsection (4)(c) does not apply to off-road vehicles, which are unlawful to use for hunting under RCW 46.09.480, unless the person has a department permit issued under RCW 77.32.237.

(5) For purposes of subsection (1) of this section, a rifle or shotgun shall not be considered loaded if the detachable clip or magazine is not inserted in or attached to the rifle or shotgun.