SDCL § 42-8-45: Operation of boat under influence of alcohol or drugs as misdemeanor.

No person may operate a boat as defined in subdivisions 42-8-2(2B), (3), (5A), or (6) while underway on the public waters of the state while:

(1) There is 0.08 percent or more by weight of alcohol in that person's blood as shown by chemical analysis of that person's breath, blood, or other bodily substance;

(2) Under the influence of an alcoholic beverage, marijuana, or any controlled drug or substance not obtained pursuant to a valid prescription, or any combination of an alcoholic beverage, marijuana, or such controlled drug or substance;

(3) Under the influence of any controlled drug or substance obtained pursuant to a valid prescription, or any other substance, to a degree which renders the person incapable of safely driving or operating such boat;

(4) Under the combined influence of an alcoholic beverage and any controlled drug or substance obtained pursuant to a valid prescription, or any other substance, to a degree which renders the person incapable of safely driving or operating such boat; or

(5) Under the influence of any substance ingested, inhaled, or otherwise taken into the body as prohibited by § 22-42-15.

Any violation of this section is a Class 1 misdemeanor.