A subpoena
A Subpoena
If you are the deponent, yes. If you are the plaintiff or defendant and they are deposing a witness or the other party, you are entitled to attended but it is not required. If you are the witness and still will not attend your own deposition they might get a subpoena to compel you. Still if it's a civil case there might not be a criminal penalty for failure to appear.
If a witness for the plaintiff does not show up for a deposition in a foreclosure case, the court may issue a subpoena to compel their attendance. Failure to comply may result in sanctions such as fines or a bench warrant. It could also weaken the plaintiff's case if crucial testimony is missing.
of Compel
Grant immunity
There is no right to forcibly compel a witness to testify, but you can be held in contempt of court for withholding your testimonhy and jailed for contempt until such time as you may decide to change your mind.
yes
Yes, you can testify without being served with a subpoena if you are willing to appear in court voluntarily. The subpoena is used to compel the attendance of a reluctant witness. Sometimes even someone willing to testify without a subpoena is still given one. This is to give formal notice of the court date as well as to ensure the appearance of the witness in case the witness changes his or her mind or finds the trial date to be inconvenient. It also gets the person out of work if the employer doesn't want to let the employee take the day off.
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.
The noun form of compel is compulsion.
compel
I will compel him to tell the truth.I wish I could compel my cat to come when I call.