Minn. Stat. § 86B.515: SIRENS AND SOUND-PRODUCING DEVICES.

Subdivision 1. Sound-producing devices.

Motorboats 16 feet or more in overall length using the waters of this state must carry sound-producing devices as prescribed by the commissioner. The operator of a motorboat shall sound these devices only when reasonably necessary to insure safe operation.

Subd. 2. Sirens.

(a) A siren may not be carried or used on a watercraft other than patrol watercraft.

(b) A siren carried or used in violation of this subdivision may be removed and seized by the sheriff. A seized siren becomes the property of the county where it was seized and may be used or disposed of as the county board determines.