Every summer weekend, game wardens patrol Lake Lewisville, Grapevine Lake, Lake Ray Hubbard, Joe Pool, and Eagle Mountain — and boating while intoxicated arrests follow the same penalty ladder as DWI. But the rules of the stop are completely different, and most boaters don't learn them until they're in handcuffs.
Same intoxication, same penalties
BWI under Texas Penal Code § 49.06 uses the identical definition of intoxication as DWI — 0.08 BAC or loss of normal faculties — and the same punishment ranges: Class B misdemeanor first offense (72 hours–180 days, up to $2,000), Class A for a second, third-degree felony for a third. "Watercraft" covers motorboats, jet skis, sailboats, kayaks, and even towed tubes.
The stop is where BWI differs — dramatically
- Wardens need no suspicion to board you. Under Parks & Wildlife Code § 31.124, officers may stop and board any vessel at any time for a "safety inspection" — life jackets, registration, fire extinguisher. Smell of alcohol during that inspection converts it into a BWI investigation. On the road, suspicion-less stops are unconstitutional in Texas; on the water, they're standard practice.
- Sobriety tests are different. Standing balance tests don't work on a rocking dock, so wardens use the seated battery (HGN eye test, finger-to-nose, palm pat, hand coordination, finger count, time estimation). These are less validated than roadside tests — a genuine defense opening, especially after a day of sun, wind, and boat vibration that mimics impairment.
- Open containers are legal on boats — for passengers and the operator. Only intoxicated operation is a crime, so "there were drinks on board" proves nothing by itself.
Yes, a BWI can suspend your driver's license
Refuse a breath or blood test after a BWI arrest on a vessel with a 50+ horsepower engine, and the implied-consent law triggers a 180-day suspension of your regular driver's license — with the same 15-day ALR deadline as a roadside DWI.
The hidden long-term risk: BWI counts as a prior
A BWI conviction is a "prior intoxication offense" under Texas law. If you're ever charged with DWI later — even decades later — that old lake weekend enhances the new charge from a first offense to a second, or a second to a felony third. Fighting a BWI now protects every future traffic stop.
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