People who have been subpoenaed in Colorado state court can file a motion with the court to quash or modify the subpoena request. The court must quash or modify it when either: The subpoena does not allow the witness a reasonable time to comply; or The subpoena requires the witness to attend a deposition in any county other than where the person resides or is employed or transacts his/her business in person, or at such other convenient place as is fixed by an order of court; The subpoena requires disclosure of privileged or other protected matter, if no exception or waiver applies; or The subpoena subjects the witness to an undue burden. Meanwhile, the judge may quash or modify a subpoena by order of the court when either: The witness's testimony would disclose a trade secret or other confidential research, development, or commercial information; or The subpoena requires that an unretained expert would provide his/her opinion or information that does not describe specific matters in dispute and results from the expert's study that was not requested by a party.