(1)(a) A charter party carrier or excursion service carrier operating a party bus must determine whether alcoholic beverages will be served or consumed in the passenger compartment of the vehicle. If it is expected that alcoholic beverages will be served or consumed in the passenger compartment, the permit holder must have obtained the appropriate liquor permit, provided a copy of the permit to the charter party carrier or excursion service carrier in advance of the trip, and be on the vehicle or reasonably proximate and available to the vehicle during the transportation service. The company must maintain the copy of the permit required with the contract of carriage.

(b) If the charter party carrier or excursion service carrier operating a party bus is the permit holder, the carrier must have a person separate from the driver be responsible for the permit holder requirements in this section and either chapter 66.20 or 66.24 RCW.

(c) The permit holder must:

(i) Be on the party bus or reasonably proximate and available to the vehicle during the transportation service;

(ii) Monitor and control party activities in a manner to prevent the driver from being distracted by the party activities; and

(iii) Assume responsibility for compliance with the terms of the special permit, if a permit is required, including compliance with RCW 66.44.270 concerning the prohibition against furnishing liquor to minors. 

(2) If at any time the charter party carrier or excursion service carrier operating a party bus believes that conditions aboard the vehicle are unsafe due to party activities involving alcohol, the carrier must remove all alcoholic beverages and lock them in the party bus trunk or other locked compartment. The carrier may cancel the trip and return the passengers to the place of origin.

(3) This section does not limit the right of a charter party carrier or excursion service carrier to prohibit the consumption of alcohol aboard the vehicle.

(4) This section does not limit the right of a permit holder to seek indemnity from any person, corporation, or other entity other than the charter party carrier or excursion service carrier.

(5) This section does not relieve a passenger of legal responsibility for his or her own conduct or the permit holder of legal responsibility for compliance with Title 66 RCW.

(6) Any charter party carrier or excursion service carrier in violation of this section is subject to a penalty of up to five thousand dollars per violation.