Wis. Stat. § 970.01
The interval between an arrest and an initial appearance is never unreasonable when the arrested suspect is already in the lawful physical custody of the state. State v. Harris, 174 Wis. 2d 367, 497 N.W.2d 742 (Ct. App. 1993). The rule that a judicial determination of probable cause must be made within 48 hours of a warrantless arrest applies to Wisconsin; failure to comply did not require suppression of evidence not obtained because of the delay when probable cause for arrest was present. State v. Koch, 175 Wis. 2d 684, 499 N.W.2d 153 (1993). Failure to conduct a probable cause hearing within 48 hours of arrest is not a jurisdictional defect and not grounds for dismissal with prejudice or voiding of a subsequent conviction unless the delay prejudiced the defendant's right to present a defense. State v. Golden, 185 Wis. 2d 763, 519 N.W.2d 659 (Ct. App. 1994). A person taken into custody on a probation hold while an investigation is made to determine if a probation violation has occurred is not under arrest and not subject to the requirement of a probable cause hearing within 48 hours of a warrantless arrest. State v. Martinez, 198 Wis. 2d 222, 542 N.W.2d 215 (Ct. App. 1995), 94-3006. A determination of probable cause made within 48 hours of a warrantless arrest generally meets the promptness requirement; if a hearing is held more than 48 hours following an arrest the burden shifts to the government to demonstrate an emergency or extraordinary circumstances. County of Riverside v. McLaughlin, 500 U.S. 44, 114 L. Ed. 2d 49 (1991).