Wash. Rev. Code § 46.20.755
If a person is required, as part of the person's judgment and sentence or as a condition of release, to install an ignition interlock device on all motor vehicles operated by the person and the person is under the jurisdiction of the municipality or county probation or supervision department, the probation or supervision department must verify the installation of the ignition interlock device or devices. The municipality or county probation or supervision department satisfies the requirement to verify the installation or installations if the municipality or county probation or supervision department receives written verification by one or more companies doing business in the state that it has installed the required device on a vehicle owned or operated by the person. The municipality or county shall have no further obligation to supervise the use of the ignition interlock device or devices by the person and shall not be civilly liable for any injuries or damages caused by the person for failing to use an ignition interlock device or for driving under the influence of intoxicating liquor or any drug or being in actual physical control of a motor vehicle under the influence of intoxicating liquor or any drug.
RCW 46.20.755
Finding-Intent-2015 2nd sp.s. c 3: See note following RCW 10.21.055.
Effective date- 2010 c 269: See note following RCW 46.20.385.