Wis. Stat. § 350.08: Owner permitting operation.

No owner or other person having charge or control of a snowmobile may knowingly authorize or permit any person to operate the snowmobile if the person is prohibited from operating a snowmobile under s. 350.05, if the person is incapable of operating a snowmobile because of physical or mental disability or if the person is under the influence of an intoxicant.