Here's the trap that catches good people: it can be perfectly legal to own something and still be a crime to drive with it. A sealed jar of legal gummies, a handgun you're licensed to carry — both can turn into a charge the instant you cross a state line, drive onto federal land, or simply keep them within reach in the wrong state. You didn't break the law on purpose. You just kept driving.
Driving with cannabis
Even where adult use is legal, almost every state treats cannabis in a vehicle like an open container: it has to be sealed and usually in the trunk, and using it while driving is its own offense. Where it's illegal, having it in the car at all is a crime. And no matter where you bought it, carrying it across a state line is a federal offense — even between two legal states.
Driving with a firearm
A gun in the car has its own rules — some states allow a loaded handgun in the glovebox, others demand it unloaded, cased, and stored apart from ammunition. Worse, a permit that's valid at home may not be honored one state over: concealed-carry reciprocity isn't automatic, and driving through a non-reciprocal state can be a felony. Grouped below by how permissive each state's carry law is — tap a state for the dated detail, and check reciprocity before a road trip.
The line is where it flips
The through-line of every story above is the same: the law doesn't change because you did something — it changes because you moved. Cross a state line and the rules flip. Drive into a national park or national forest and federal law takes over, where cannabis is illegal everywhere regardless of your state. That's the whole reason a lot of people break the law without ever meaning to — see laws you didn't know you were breaking and cannabis & guns on federal land.
Know it the moment it changes
You can't memorize 50 states. The point of LawLert is that you don't have to: check your state above, and turn on alerts so your phone tells you the instant you cross into a place where what's in your car is suddenly a problem.
FAQ
Is it legal to drive with marijuana in your car?
It depends entirely on the state. Where adult use is legal you can usually transport it, but most states require it sealed or in the trunk — an open or accessible container can be a citation or worse. Where cannabis is illegal, simply having it in the car is a crime. And it is always a federal offense to carry it across a state line, even between two legal states.
Can I drive across a state line with legal weed?
No. Cannabis is illegal under federal law, so transporting it across any state line is a federal crime — even from one legal state to another. An edible that's legal at home can be a serious charge the moment you cross the border.
Can I keep a gun in my car?
Often yes, but the rules vary a lot: some states allow a loaded handgun in the glovebox, others require it unloaded, cased, and separate from ammunition. A concealed-carry permit valid at home may not be honored one state over — reciprocity is not automatic. Check your state and your route before you drive.
Does my concealed-carry permit work in every state?
No. Each state decides which other states' permits it honors, and a few honor none. Driving through a non-reciprocal state with a carried firearm can be a felony. See LawLert's concealed-carry reciprocity guide.
What about national parks and forests?
Federal land changes the rules again. Cannabis is illegal on all federal land regardless of state law — national parks, national forests, and BLM land. Firearms in national parks follow the law of the state the park sits in, but it remains a federal crime to bring one into a federal building such as a visitor center.
How current and trustworthy is this?
Every state's status here comes from LawLert's officially-sourced, dated legal data. For the specifics that apply to you, tap your state for the cited detail — and turn on alerts so you know the moment a rule changes or you cross into a place where it's different.