Minn. Stat. § 260B.008
(b) Restraints may not be used on a child appearing in court in a proceeding under this chapter unless the court finds that:
(1) the use of restraints is necessary:
(2) there are no less restrictive alternatives to restraints that will prevent flight or physical harm to the child or another, including but not limited to the presence of court personnel, law enforcement officers, or bailiffs.
The finding in clause (1), item (i), may be based, among other things, on the child having a history of disruptive courtroom behavior or behavior while in custody for any current or prior offense that has placed others in potentially harmful situations, or presenting a substantial risk of inflicting physical harm on the child or others as evidenced by past behavior. The court may take into account the physical structure of the courthouse in assessing the applicability of the above factors to the individual child.