Miss. Code Ann. § 59-23-3

For the purposes of this chapter, the following terms shall have the following meanings unless the context shall prescribe otherwise: (a) “ Chemical test ” means an analysis of a person's blood, breath, urine or other bodily substance for the determination of the presence of alcohol or any other substance which may impair a person's mental or physical ability. (b) “ Intoxicated ” means under the influence of alcohol or any combination of alcohol, controlled substance or drugs, so that there is impaired thought and action and loss of normal control of a person's faculties to such an extent as to endanger any person. (c) “ Law enforcement officer ” means any officer described in Section 63-11-19 and includes a conservation officer employed by the Mississippi Department of Wildlife, Fisheries and Parks and a marine law enforcement officer employed by the Department of Marine Resources. (d) “ Prima facie evidence of intoxication ” includes evidence that at the time of an alleged violation there was eight one-hundredths percent (.08%) or more by weight of alcohol in the person's blood. (e) “ Public waters ” means all public waters over which the state has jurisdiction. (f) “ Watercraft ” means a motorized vessel with a motor of twenty-five (25) horsepower or greater used for transportation on public waters and personal watercraft (jet skis). (g) “ Operates a watercraft ” or “ operation of a watercraft ” shall mean a watercraft that is underway in the water.