Wis. Stat. § 938.28: Failure to obey summons; capias.

If any person summoned under this chapter fails without reasonable cause to appear, he or she may be proceeded against for contempt of court under ch. 785. If the summons cannot be served, if the parties served fail to respond to the summons, or if it appears to the court that the service will be ineffectual, a capias may be issued for the parent, guardian, and legal custodian or for the juvenile. Subchapter IV governs the taking and holding of a juvenile in custody.