Requires the Washington institute for public policy, in collaboration with the department of social and health services and other applicable entities, to undertake a search for a validated mental health assessment tool to be used by designated mental health professionals when undertaking assessments of individuals for detention, commitment, and revocation under the involuntary treatment act. This requirement expires June 30, 2011.

Revises the definition of "likelihood of serious harm" for the purposes of the involuntary treatment act by including a person who has committed a recent overt act that creates a reasonable apprehension of harm to the physical safety of another person or the community in the mind of an objective person who knows the history of any violent acts or the history of the mental condition of the person engaging in the act.