Establishes a pilot program in Snohomish county to study the effect of chemical dependency diversions.

Allows a police officer who has reasonable cause to believe that an individual has committed acts constituting a nonfelony crime that is not a serious offense, and has not committed a possible violation of DUI or physical control laws, and is known by history or consultation with staff designated by the county to suffer from a chemical dependency, to: (1) Take the individual to an approved chemical dependency treatment provider for treatment;

(2) Take the individual to an emergency medical service customarily used for incapacitated persons, if no approved treatment program is readily available;

(3) Refer the individual to a chemical dependency professional for initial detention and proceeding under chapter 70.96A RCW (treatment for alcoholism, intoxication, and drug addiction); or

(4) Release the individual upon agreement to voluntary participation in outpatient treatment.

Requires a chemical dependency provider, if an individual is released to the community, to inform the arresting officer of the release if the officer has requested notification and provided contact information.

Requires Snohomish county to evaluate the effects of the pilot program and submit a report to the legislature summarizing the effectiveness of the pilot program.

Provides a July 31, 2019, expiration date for the pilot program.