In what circumstances will a defendant be found guilty of a charge of possession of a prohibited substance under the Mental Health Act?

In light of the fact the text messages had been sent from a phone in defendant's possession at the time of his arrest, in addition to the content of the messages, we conclude the text messages were sufficiently authenticated to show they were likely authored by defendant. Although conflicting inferences can be drawn from this evidence, the trial court correctly noted this goes to the document's weight as evidence, not its admissibility. (People v. Goldsmith, supra, 59 Cal.4th at p. 267.)