Minn. Stat. § 326.338
Subd. 1. Private detective.
Persons who for a fee, reward, or other consideration, undertake any of the following acts for the purpose of obtaining information for others are considered to be engaged in the business of a private detective:
Subd. 2.
[Repealed, 1987 c 360 s 26]
Subd. 3.
[Repealed, 1987 c 360 s 26]
Subd. 4. Protective agent.
A person who for a fee, reward, or other valuable consideration undertakes any of the following acts is considered to be engaged in the business of protective agent:
(6) providing guards or other security personnel to transport prisoners or any other person arrested on a warrant, except that this does not apply to the transport or escort of offenders by staff of the Department of Corrections; the transport of a person by the sheriff of a county to the appropriate adult or juvenile correctional facility as designated by the commissioner of corrections or to and from court in connection with postconviction, habeas corpus, or intrastate mandatory disposition of detainers proceedings; the transfer of a person by emergency medical services personnel; or the transfer of a person by a peace officer as defined in section 626.84, subdivision 1, paragraph (c), or employed by a federal law enforcement agency.
A person covered by this subdivision may perform the traffic-control duties in clause (4) in place of a police officer when a special permit is required, provided that the protective agent is first-aid qualified.