Declares an intent to clarify the law on medical marijuana so the lawful use of this substance is not impaired and medical practitioners are able to exercise their best professional judgment in the delivery of medical treatment without fear of state criminal prosecution. This act is also intended to provide clarification to law enforcement and to all parties in the judicial system.

Provides that the department shall establish a voluntary registration program for the issuance of voluntary registry identification cards to any otherwise qualified patient under RCW 69.51A.010 who wishes to obtain a voluntary registry identification card.

Directs the department to create and maintain a list of the persons who have voluntarily requested that they be issued registry identification cards pursuant to this act. Except as provided in this act, names and other identifying information from the list established pursuant to this act shall be confidential and not subject to public disclosure under any local, state, or federal law.

Provides that names and other identifying information for the list established pursuant to this act may be released to: (1) Authorized employees of the department as necessary to perform official duties of the department; and

(2) Authorized employees of the state or local law enforcement agencies, only as necessary to verify that a person is a lawful possessor of a voluntary registry identification card.