These are questions that should be asked of your son's attorney. He has far more knowledge about the case than anyone on AVVO. I will revise your post so that criminal defense attorneys will see it.
Commitment to the Department of State Hospitals for the purposes of restoring a defendant to competency to stand trial does not count as time served. You should confer with your son's attorney for a complete understanding of what is going on.
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A judge called time out in the criminal case because there was a finding made that your son is not competent to be a defendant. That means a mental disorder disease or defect caused him to not be able to assist in his defense. He will go to the Stare Hispital until his trial competence is restored, and thn will return to court to have his case resume.
Hospital time counts towards any sentence but he does not get conduct credits in addition to actual time.
Time at the hospital varies a lot, dependent on how the oatient responds to meds, classes, and counseling.
The purpose is to to make the patient "well", only to become "competent".
Not knowing what he is doing goes to a Not Guilty by Reason of Insanity defense. The legal standards are entirely different than incompetency. Insanity requires either not knowing the difference between right and wrong; or not understanding the nature of his actions.
NGI plead are carefully considered because they can result in long term hospitalizations.
For reading about incompetency proceedings, read the CA Penal Code starting at PC sec 1368.
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