What is the current state of the law on the basis of a psychiatric opinion that a person with severe mental illness is dangerous to others?

in remission or cannot be kept in remission without treatment, and that by reason of his or her severe mental disorder, the patient represents a substantial danger of physical harm to others.'" (People v. Gregerson (2011) 202 Cal.App.4th 306, 314.)

A single opinion by a psychiatric expert that a person currently is dangerous due to a severe mental disorder can constitute substantial evidence to support extension of a commitment. (People v. Zapisek (2007) 147 Cal.App.4th 1151, 1165 [ 1026.5 commitment].) A trial court is "entitled to rely" on the expert testimony that a defendant continues "to act inappropriately based on delusions." (Id. at p. 1168.)