can you refuse a subpoena to testify
A subpoena is a court order, even if signed by an attorney or court clerk instead of a judge. If you violate a court order to appear you can get into trouble for contempt of court or, in some cases, something worse. Moreover, if you are ever arrested for anything the whole rest of your life, your failure to appear in this case will be used against you to set a high bond, or to deny bond entirely.