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 taken an action or engaged in certain behavior that is likely to be followed in the near future by an attempt to do physical harm or cause substantial property destruction.