7 Items That Can Be Illegal to Carry in Your Car, Even in the Trunk

Most drivers think of their car trunk as a convenient place to store things they do not need immediately. Whether it is camping equipment, fireworks purchased during a road trip, or other personal belongings, the trunk offers extra space and keeps cargo out of sight. However, putting something in the trunk does not automatically make transporting it legal.

Across the United States, certain state and federal rules restrict what people can possess or carry in their vehicles. Some laws focus on the item itself, while others consider where it came from, its condition, the destination, or the purpose of the trip.

Here are seven items that can create legal problems for drivers, depending on where they travel and the circumstances involved.

Consumer Fireworks, Including Sparklers

That box of fireworks purchased during an out-of-state shopping trip might not be legal to bring home if you are heading into Massachusetts. The state generally prohibits possessing, using, selling, or offering fireworks for sale without the required authorization.

The restriction covers more than traditional firecrackers. Massachusetts law also includes sparklers, Roman candles, and other specified fireworks in its definition. This means that buying them legally in another state does not automatically make possessing them lawful once you cross into Massachusetts.

There are exceptions for authorized displays, certain theatrical and ceremonial activities, and specified signaling devices. Ordinary emergency road flares should not be confused with prohibited consumer fireworks.

Untreated Firewood Transported Beyond New York’s Limits

Planning a camping trip in New York? Think twice before loading untreated firewood into your vehicle, particularly if you are bringing it from another state.

Under New York’s firewood transportation rules, drivers cannot bring untreated firewood into the state from another state or country. Even firewood originating within New York is generally subject to a 50-mile transportation limit, measured in a straight line from its source or origin. These restrictions help prevent the spread of invasive pests.

There is an important exception. Firewood treated to the state’s required standard of 160 degrees Fahrenheit for 75 minutes and accompanied by appropriate documentation can travel without the ordinary distance restriction.

Simply buying seasoned or naturally dried wood does not satisfy this requirement. A kiln-dried label alone is also not proof that the treatment meets the state’s standard.

Before loading firewood for your next camping trip, check its origin and treatment documentation.

Hollow-Point Ammunition

Hollow-point ammunition is another item that requires careful attention when driving through New Jersey. The state has specific restrictions on its possession and transportation, although civilian ownership is not completely prohibited.

According to the New Jersey State Police, individuals may purchase and possess this ammunition at their homes or on property they own or possess. Possession and use at an authorized shooting range are also permitted. Certain transportation connected to these activities falls within recognized legal exceptions.

However, placing ammunition inside a locked trunk does not automatically make every journey lawful. The purpose and circumstances of the trip matter. The state also distinguishes hollow-point ammunition from certain polymer-filled ammunition and provides separate guidance concerning interstate passage.

Drivers should therefore understand which exception applies before traveling with this type of ammunition. The restriction is not a blanket ban on every person carrying it through New Jersey.

A Loaded Handgun

California has specific requirements for transporting handguns in a vehicle, and simply locking the trunk is not enough to satisfy its ordinary transportation rules.

According to the California Department of Justice, an eligible person transporting a handgun under the ordinary rules must generally ensure that the firearm is unloaded and secured inside the vehicle’s locked trunk or another qualifying locked container.

This distinction matters because an unloaded handgun in a locked trunk can satisfy the ordinary transportation requirements, while a loaded handgun does not meet those same requirements.

California also treats handguns differently from nonconcealable rifles and shotguns, as well as registered assault weapons. Carry licenses and other legal exceptions may affect the rules that apply in particular circumstances.

For everyday drivers, the main lesson is straightforward: Do not assume that placing a loaded handgun in a locked trunk makes its transportation lawful.

Recreational Marijuana

Recreational marijuana may be legal under the laws of the state where you live, but that does not mean you can bring it into a national park.

The National Park Service maintains federal rules prohibiting marijuana possession in national parks, including locations in states where recreational marijuana is permitted.

This restriction concerns possession itself, not simply smoking marijuana or operating a vehicle while impaired. Consequently, packing recreational marijuana into a bag and placing it in your trunk does not create an exception.

For example, visitors heading to Shenandoah National Park or Death Valley National Park should understand that state legalization does not automatically extend to these federally managed locations.

The distinction is especially relevant to people who regularly travel between states or include national parks in their vacation plans.

Before entering a national park, check its applicable rules rather than assuming that the laws of the surrounding state determine what you can bring.

Prohibited Invasive Species

A plant or animal carried in your vehicle might create a legal problem if it belongs to a species classified as prohibited in New York.

The New York Department of Environmental Conservation separates invasive species into prohibited and regulated categories. Prohibited species generally cannot be sold, imported, purchased, transported, introduced, or propagated.

That distinction matters because regulated species do not automatically face the same general transportation prohibition.

There are also exceptions. The department may issue permits for approved research, educational activities, and other authorized purposes. Additionally, a permit is not required to possess or transport certain prohibited species for controlling or managing an existing infestation. Some plant cultivars also qualify for exemptions.

Therefore, not every invasive plant or animal is automatically illegal to transport. Its classification and the reason for moving it matter. If you are transporting plants or animals in New York, check their legal classification before putting them in your vehicle.

A Radar Detector

Radar detectors can also create legal complications for drivers traveling through Virginia. The state prohibits operating a vehicle on its highways when equipped with a device designed to detect or interfere with police speed-measuring equipment, subject to a specific transportation exception.

Under Virginia’s radar-detector law, the presence of a prohibited device in or on a vehicle can serve as prima facie evidence of a violation.

However, the law does not completely prohibit transporting radar detectors. An exception applies when the device has no power source and is not readily accessible to the driver or any passenger.

Both conditions must be satisfied. Simply switching off a detector does not necessarily meet the requirement if it remains powered by an available source or accessible for use.

This means drivers can transport a radar detector under the specified conditions, but they should not assume that putting it in the trunk automatically makes the trip lawful.

Know the Rules Before Loading Your Trunk

A vehicle trunk provides convenient storage, but it does not override state or federal transportation restrictions. As these examples demonstrate, the rules can depend on the item, its condition, its origin, your destination, and the purpose of your journey.

Before traveling across state lines or entering federally managed property, check the applicable regulations. This article provides general public information, not individualized legal advice.