Mississippi law defines boating under the influence as operating a vessel while impaired by alcohol or drugs to the extent that safe operation is affected, or having a blood alcohol concentration at or above prescribed statutory thresholds. Local enforcement on Biloxi waters relies on observations and testing to determine impairment. The definition mirrors many principles found in driving-related impairment statutes but is applied in marine settings where additional environmental factors may play a role. Understanding the statutory language is important to assessing whether the government’s evidence meets legal burden. A defense review looks at how the initial contact occurred, whether the operation element is established, and whether testing or observations reliably indicate impairment. Mississippi statutes and case law provide particular rules that apply to maritime stops and chemical testing, and these can be scrutinized for procedural or substantive errors. For anyone charged in Biloxi, a careful legal assessment of how these definitions apply to the facts of the incident can inform the best path forward.