Cal. HSC § 11553

The fact that a person is or has been, or is suspected of being, a user of cannabis is not alone sufficient grounds upon which to invoke Section 11551 or 11552. This section shall not be construed to limit the discretion of a judge to invoke Section 11551 or 11552 if the court has reason to believe a person is or has been a user of narcotics or drugs other than cannabis.