DUI Laws

Citizens Count Editor

In New Hampshire it is illegal to drive a car or operate any other vehicle while under the influence of drugs or alcohol. 

See New Hampshire’s law on operating under the influence of drugs or alcohol

Sobriety test rules

Law enforcement may ask anyone operating a vehicle in New Hampshire to take various tests to determine if he or she is operating under the influence, such as a breath test or a blood test. 

If a person refuses to take a test, he or she faces automatic license suspension for 180 days. Even if someone refuses a test, law enforcement can gather other evidence that suggests the driver was intoxicated (such as open alcohol containers in the car), and a person may still be charged with operating under the influence.

Blood alcohol limits

While it can be difficult to judge if a person is intoxicated by marijuana or another drug, the law spells out specific thresholds for alcohol. 

  • It is illegal for anyone over the age of twenty-one to operate a vehicle with a blood alcohol concentration (BAC) of 0.08 or more in New Hampshire. 
  • Commercial drivers have a BAC limit of 0.04. 
  • For anyone under age twenty-one, the BAC limit is 0.02. 

The number of drinks it takes to reach a 0.08 BAC varies greatly depending on a number of factors, including weight, age, gender, the time period over which the drinks were consumed, and how much you’ve had to eat.

You can use an online BAC calculator to estimate your blood alcohol level, but note that this isn't necessarily accurate since everyone processes alcohol differently. The only safe way to be sure your blood alcohol level is below the legal limit is not to drink before you drive.

Marijuana and other drugs

Blood tests may determine if a driver if intoxicated by a drug other than alcohol, but those tests are problematic. For example, there is currently no test for marijuana intoxication that is 100% reliable.  Marijuana affects people differently, and THC — the psychoactive drug in marijuana — can stay in a person’s body for days or even weeks. This can make it difficult for prosecutors to prove an individual was operating under the influence of a drug other than alcohol.

However, if a driver is found transporting any controlled drug, his or her license will be suspended for at least sixty days, whether or not he or she is intoxicated.

Penalties for drunk and drugged driving

Driving under the influence in New Hampshire means a minimum sentence of:

  • License suspension of at least three months (at least one year if the offender is under age twenty-one) 
  • A fine of at least $500
  • An impaired driver education program
  • Screening for substance abuse disorder and, if necessary, completion of a treatment plan

Penalties get stronger for repeat or serious offenders or for people who violate the terms of their first sentence, and can include:

  • Jail time
  • Installation of an ignition interlock device (which requires the driver to pass a breath test to start a car)
  • Longer license suspensions
  • Random drug testing

A person may apply to annul a DUI conviction after ten years.  If it is a person’s first DUI conviction, he or she may petition the court to reduce the conviction to a violation after one year.

Learn more about criminal records annulment

Cinderella license law

The first time someone is convicted of driving under the influence in New Hampshire, he or she may petition the court for limited driving privileges, sometimes called a “Cinderella license,” after forty-five days of license suspension. 

A Cinderella license allows the person to drive to work, job training, education, addiction treatment, or other necessary medical treatment.  The driver must install an ignition interlock device.

Sobriety checkpoints

A sobriety checkpoint is a police roadblock that systematically checks passing drivers for signs of intoxication. 

While some state courts have ruled sobriety checkpoints violate the constitutional protection against unreasonable search and seizure, the U.S. Supreme Court ruled sobriety checkpoints are legal.

In New Hampshire, police have to get permission from a court to hold sobriety checks, which are then advertised in the newspaper.

Laws in other states

Some states have stricter DUI laws.  Here are some examples:

  • Lower BAC limits: for example, Utah will lower the BAC limit for drunk driving to 0.05 starting in 2019.
  • Visible identifiers: drivers found operating under the influence in Ohio can be required to use special red and yellow license plates.
  • Insurance penalties: about half of states have a law that allows insurance companies to deny a claim for an injury that occurred while a person was intoxicated. 
  • Health provider reporting requirements: some states, such as Oregon, require health care professionals to contact law enforcement if a patient from a car accident has a BAC over the legal limit.
  • Mandatory impounding: some states, such as Mississippi, allow or require courts to impound a vehicle after the owner is arrested or convicted of driving under the influence. The impoundment can last anywhere from a few hours to a few months, depending on the state.
  • Strict THC rules: some states, such as Delaware, have a zero tolerance law that makes it a crime to drive with any trace of THC (the psychoactive drug in marijuana) in the blood.

Learn more about other issues related to road safety


"For" Position

By Citizens Count Editor

“NH should impose stronger penalties for DUI.”

  • A 2017 report from WalletHub ranked New Hampshire 31st in the nation for the strictness of its drunk driving penalties. This ranking shows New Hampshire has room to grow compared to other states when it comes to DUI laws.  For example, other states impose longer jail sentences, allow judges to impound a drunk driver’s vehicle, or make operating under the influence an automatic felony after just one conviction. 
  • According to data from the National Highway Traffic Safety Administration, the percentage of fatal traffic collisions involving a drunk driver in New Hampshire has not decreased significantly over the past twenty years, staying near 30%. This shows New Hampshire needs to do more to decrease drunk driving.
  • Law enforcement in New Hampshire have expressed concern that marijuana decriminalization in New Hampshire—and legalization in neighboring states—will increase the number of people driving while impaired by marijuana.  To discourage residents from driving while high, New Hampshire needs stricter penalties for driving with any amount of THC (the psychoactive drug in marijuana) in the blood.  Current law is too ambiguous about what qualifies as operating under the influence of marijuana.

"Against" Position

By Citizens Count Editor

“NH should not impose stronger penalties for DUI.”

  • According to the Centers for Disease Control and Prevention and the Insurance Institute for Highway Safety, the rates of drunk driving and drunk driving fatalities are lower in New Hampshire than the rest of the United States. These statistics suggest New Hampshire is doing an adequate job compared to other states in preventing drunk driving.
  • According to data from the Youth Risk Behavior Survey, from 2005 to 2015 the percentage of New Hampshire high schoolers who rode in the car with a drunk driver decreased from 22% to 16%. This shows that the number of young drivers operating under the influence in New Hampshire is decreasing.
  • According to the National Highway Traffic Safety Administration, more traffic fatalities in New Hampshire involve a person not wearing a seat belt than involve a drunk driver.  This suggests drunk driving is not the most pressing road safety issue in New Hampshire. 
  • When it comes to preventing impaired driving, public education campaigns are arguably just as effective and less expensive than harsh criminal penalties.


Passed House

Makes driving after a license has been suspended for driving or operating under the influence of drugs or liquor in this or any out-of-state jurisdiction a misdemeanor, and imposes a $500 fine. According to the House Transportation committee, "There are many instances where an out-of-state traffic offense conviction counts as a prior offense when convicted again in New Hampshire. Ironically, driving after revocation or suspension was not included in that category. This bill corrects that oversight."

Tabled in the House

Modifies the penalties for a third and fourth DUI, specifying that the DUI must have occurred within twenty years of a previous DUI conviction to count. The bill also adds a misdemeanor penalty for a DUI conviction if there are similar convictions more than ten years earlier.

Killed in the House

Allows for the limited restoration of driving privileges for a person whose license has been suspended after refusing to consent to a DUI test. The bill also allows the courts to determine whether such persons have to use an ignition interlock device.

Passed House

Allows persons charged with a DUI to register for an impaired driving education program after arraignment. A DUI conviction would require attending such a program.

Passed House

Requires ignition interlock devices to be installed on any vehicle registered to or used by a person subject to an ignition interlock order, not just a vehicle used "on a regular basis."

In Committee

Modifies the circumstances under which a driver's license may be suspended or revoked, or restored. For example, this bill removes the authority to suspend a license solely for failure to pay a fine. The House amended the bill to study the creation of restricted driving licenses for participants in drug court.

Passed Senate

Expands the circumstances that qualify as "aggravated" driving while intoxicated to include driving a vehicle with a gross combination weight rating of 10,001 pounds or more. This bill also clarifies that a driver must immediately be disqualified for driving a commercial vehicle after refusing a blood alcohol concentration test. Lastly, this bill states that if a person disqualified from driving a commercial vehicle applies for a hearing, the hearing must occur within fifteen days.

In Committee

Defines "drive or attempt to drive" in the DUI law to exclude sleeping in a parked vehicle and any activity "lacking intent to control the vehicle in a manner which could pose a danger to the public."

Passed Senate

Increases the minimum sentence for negligent homicide, based on prior convictions for driving under the influence of drugs or alcohol.  The Senate amended the bill to give courts more discretion to decide whether or not to impose the longer sentence.

Signed by Governor

Adds violations to the type of records that shall be purged from a motor vehicle record after seven years. This bill also specifies that certain offenses - such as a DUI - cannot be purged from a motor vehicle record until 10 years after a defendant's driver's license is reinstated.

Passed House and Senate

Defines "drive or attempt to drive" in the DUI law to exclude sleeping in a parked vehicle, so long as the person is not in the driver's seat.

Signed by Governor

Clarifies the time frame for a blood test to determine alcohol concentration. For example, this bill clarifies that if a person elects to have a blood test, that test takes place after completing an infrared molecular absorption test requested by a law enforcement officer.

Signed by Governor

Clarifies the requirements for issuance of a driver's license with limited driving privileges. For example, this bill clarifies that an ignition interlock device must be installed in the vehicle for the duration of the limited privilege as well as one year immediately following full restoration of driving privileges.

Passed House and Senate

Prohibits a fee for annuling an arrest and court record when a person is found not guilty or is not prosecuted. The House amended the bill to also allow a person who was less than 25 years old when convicted of a simple-possession drug-related crime to petition for annulment of arrest, conviction and sentence. The House and Senate must agree on a final version of the bill.

Killed in the Senate

Prohibits sobriety checkpoints.

Signed by Governor

Reinstates a minimum misdemeanor charge for driving after being certified as an habitual offender, in certain circumstances.

Signed by Governor

Requires that all ignition interlock devices required to be installed after January 1, 2019 be enhanced technology ignition interlock devices. Enhanced technology ingnition interlock devices take a picture of the driver, store data about the driver's alcohol level, etc.

Killed in the House

Defines "drive or attempt to drive" in the DUI law to exclude sleeping in a parked vehicle and any activity outside an automobile.

Killed in the House

Requires a search warrant to obtain blood samples when someone is under investigation for driving under the influence. According to the Judicial Branch, however, the bill is unclear.

Signed by Governor

Authorizes a court to require installation of an ignition interlock device as a condition of driver's license reinstatement for a person convicted of manslaughter involving alcohol.

Signed by Governor

Allows the Department of Safety to take action for certain ignition interlock violations.

Killed in the House

Allows a person who has had their license suspended or revoked in another state to apply for limited driving privileges under New Hampshire law.

Killed in the House

Authorizes limited privilege drivers' licenses for persons whose licenses have been administratively suspended for operating under the influence or refusal to take a sobriety test. At the time of this bill's submission, the law only allows limited driving privileges after someone is convicted of operating under the influence in criminal court; administrative license suspension is a separate hearing with a lower burden of proof, so a person can be found not guilty of operating under the influence but still have his or her license suspended.

Signed by Governor

Authorizes the use of liquid chromatograph tests as evidence of drug or alcohol intoxication, as requested by the Department of Safety.

Killed in the House

Requires the indefinite revocation of the driver’s license of any individual convicted of a third driving while intoxicated offense.

Signed by Governor

Requires the driver's license exam to include questions regarding distracted driving, driving under the influence, and driving during poor weather conditions.

Signed by Governor

Requires a person receiving a limited privilege driver's license to be subject to the ignition interlock program for one year after restoration of full driving privileges.

Signed by Governor

Keeps motor vehicle records on file for 10 years for residents convicted of DWI or who have lost their license for another reason; at the time of this bill's submission records were kept on file for 7 years.

Killed in the House

Increases the minimum license revocation period for driving while intoxicated, third and fourth offenses.

Signed by Governor

Eliminates some mandatory minimum sentences for driving with a revoked or suspended license.

Signed by Governor

Revises the law governing ingition interlock devices. For example, this bill allows inspection of an ingition interlock device to make sure the device has not been tampered with.

Should NH impose stronger penalties for DUI?


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Issue Status

The Legislature has passed a bill that would allow intoxicated people to sleep or shelter in their cars, as long as it was clear they did not intend to drive the vehicle. Track the bill in the Legislative History section below.


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