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In the Canadian justice system, you have an obligation to testify if you receive a subpoena. You must tell the truth and if you do not do so, you can be charged with perjury.
If, for very good reasons, you cannot be at court, you should immediately contact whoever subpoenaed you or call the Witness Notifier. Even though you may have a good reason for not attending, you must get permission to be absent from court. If your evidence is very important in the trial, the trial might be rescheduled.