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.

Requires the court or evaluating designated mental health professional to consider certain symptoms and behavior when determining whether a person is gravely disabled or presents a likelihood of serious harm.