No, it does not only apply when a driver is drunk, and no, putting a cap back on the bottle does not magically make it legal. An open container law is a rule that restricts having unsealed alcohol in the passenger area of a vehicle, whether or not anyone is actively drinking. The point is to prevent alcohol from being readily available inside a moving car. In many states, the rule can apply to drivers, passengers, or both, and it usually turns on where the container is located and whether the seal has been broken.

That matters because an open container stop can quickly become a bigger investigation. What starts as a traffic stop may lead to questions about DUI, field sobriety testing, a vehicle search, or other citations. Bad roadside advice often tells people that an open beer belongs to "the passenger, so it's fine." Often it is not fine. Delaware law is stricter than that myth suggests.

In Delaware, the state's open container rule in Title 21 of the Delaware Code (2025) generally bars drivers and passengers from possessing or consuming alcoholic liquor in the passenger area of a motor vehicle on a public highway. That can matter in a crash claim because it may be used as evidence of negligence or impaired judgment, even if no DUI charge sticks. On busy roads near New Castle, where commercial traffic is heavy, that kind of evidence can influence fault arguments, insurance negotiations, and damages.