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In California, attorney are authorized to issue subpoenas to in-state witnesses. However, in order to obtain a subpoena of a witness who is out-of-state, the person seeking the subpoena must get an order signed by the judge.
File a motion to quash (rescind) with the court where the subpoena was issued. If the judge agrees that the subpoena has no merit he or she will declare it invalid. Usually filing such a motion is the only way to have a subpoena rescinded other than the attorney who issued it voluntarily canceling it.
A subpoena deuces tecum can only be filed for persons or documents related to the case at hand. Issuing a subpoena for a Judge to appear in court is not likely to be granted unless this person can serve as a material witness for the defense/prosecution.
By issuing a subpoena and confirming that the subpoena has been served on the wittness. If the person doesn't respond to the subpoena in some cases the DA can then ask for a Bench Warrant to issue. The wittness could then be arrested and asked questions while in custody. The potential witness is served a subpoena and is legally obligated to appear at the time stated or be charged with contempt of court. In which case a warrant will be issued for the person's arrest and after the person is taken into custody he or she will still be brought into court to testify. The prosecutor can request the court to deem the person a hostile witness and the judge can order the individual to answer questions put to them or face further contempt and obstruction charges.
Subpoena is typically issued by the clerk of the court, mostly in the name of judge presiding over the case. The subpoena will usually be on the letterhead of the court where the case is filed, name the parties to the case, and be addressed by name to the person whose testimony is being sought.
In order to check if a subpoena has been issued, you need to check with the "Clerk of the Court" of the judge who may have issued the Subpoena. For example, if its a criminal subpoena. A good place to start is at your local City Clerk courthouse, or district courthouse County Clerk. They should have a record on file.
Being a witness at a trial is not like being a student in school. A doctor's note will not automatically excuse you. At the very least contact the attorney that subpoena' d you and notify them. You'd better be plenty sick or injured. If you're subpoena'd as a witness in a trial I would NOT fail to show up to answer the subpoena and later hope that the judge will forgive you.
It is possible - ignoring a subpoena is a "contempt of court. It depends on what the judge decides.
The local law enforcement agency picks the person up to appear before the judge. what happens when you appear before the Judge
Not enough information is disclosed inthe question. If it was a bench warrant that was issued for you, it will remain in effect until withdrawn by the issuing judge. If you were a material witness in a criminal tlrial and your "no show" caused a mistrial it is possible that you could be charged criminally. If it was for a civil trial, you may be facing a fine or a civil contempt charge. Not enough is known in order to give a more exact or specific answer.
If the notice was in the form of a subpoena or summons from the court issued over a judge's signature, yes. If not, it is optional - UNLESS - you happen to be one of the principals to the suit, then you'd be foolish not to attend.
Too many variables to answer the question. How serious was the assault? What was he charged with? Were there witnesses to it? What (if any) is his criminal record? (it would have a bearing on the severity of the prosecution) If you were served with a subpoena to testify as a witness, I suggest that you appear as directed. If not, the judge COULD issue a warrant for your arrest and compel you to appear.