MI HB4441

Prohibits operating a motorboat under the influence of alcohol (blood alcohol content 0.08% or higher), controlled substances, or with visibly impaired ability due to alcohol or drug consumption.

Establishes separate penalties for minors under 21 years old who operate motorboats with any bodily alcohol content, and prohibits operation of motorboats with passengers under 16 years old while impaired.

Creates criminal penalties ranging from misdemeanor violations (fines $100-$500, up to 93 days imprisonment, community service) to felonies (up to 15 years imprisonment for deaths caused, up to 5 years for serious injuries) depending on prior convictions and harm caused.

Authorizes peace officers to conduct preliminary breath analysis testing and arrest operators suspected of boating while impaired without a warrant; establishes refusal to submit to chemical testing as a civil infraction with penalties.

Requires mandatory boating operation prohibitions upon conviction, ranging from 1-2 years for first impaired operation convictions to permanent bans for multiple convictions within 7-10 years or causing death or serious injury.