Wis. Stat. § 938.08

(1) It is the duty of each person appointed to furnish services to the court as provided in ss. 938.06 and 938.07 to make such investigations and exercise such discretionary powers as the judge may direct, to keep a written record of such investigations and to submit a report to the judge. The person shall keep informed concerning the conduct and condition of the juvenile under the person's supervision and shall report thereon as the judge directs.

(2) Except as provided in sub. (3) and ss. 938.355 (6d) and 938.534 (1) , any person authorized to provide or providing intake or dispositional services for the court under s. 938.067 or 938.069 has the power of police officers and deputy sheriffs only for the purpose of taking a juvenile into physical custody when the juvenile comes voluntarily or is suffering from illness or injury or is in immediate danger from his or her surroundings and removal from the surroundings is necessary.

(3) (a) In addition to the law enforcement authority specified in sub. (2) , department personnel designated by the department, personnel of an agency contracted with under s. 301.08 (1) (b) 3. designated by agreement between the agency and the department and personnel of a county contracted with under s. 301.08 (1) (b) 4. designated by agreement between the county and the department have the power of law enforcement authorities to take a juvenile into physical custody under the following conditions: 1. If they are in prompt pursuit of a juvenile who has run away from a secured correctional facility, a residential care center for children and youth, or a secured group home. 2. If the juvenile has failed to return to a secured correctional facility, a residential care center for children and youth, or a secured group home after any authorized absence. (b) A juvenile who is taken into custody under par. (a) may be returned directly to the secured correctional facility, residential care center for children and youth, or secured group home and shall have a hearing regarding placement in a disciplinary cottage or in disciplinary status in accordance with ch. 227 .