Driving Under the Influence of Drugs in New Jersey

You do not have to be drunk to face a DWI charge in New Jersey. Driving under the influence of any drug — illegal, prescription, or over-the-counter — is treated the same as alcohol-related DWI under the law.

New Jersey prosecutors are charging drug DUI cases more aggressively than ever. With the legalization of recreational marijuana, law enforcement has increased its focus on drugged driving. At Papa Alpha & Alpha Law Firm in Springfield, NJ, we defend people facing these complex charges.

The Law — N.J.S.A. 39:4-50(a)

New Jersey's DWI statute does not distinguish between alcohol and drugs. Under N.J.S.A. 39:4-50(a), it is illegal to operate a motor vehicle while under the influence of any narcotic, hallucinogenic, or habit-producing drug.

The penalties for a drug DUI are identical to an alcohol DWI:

• First offense: Fines of $300 to $500, up to 30 days in jail, license suspension with ignition interlock, IDRC attendance, and $1,000 annual insurance surcharge for three years
• Second offense: Fines of $500 to $1,000, mandatory 48 hours to 90 days in jail, 1 to 2 year license revocation, 2 to 4 year interlock requirement
• Third offense: $1,000 fine, 180 days in jail, 8-year license revocation

What Drugs Can Lead to a DUI Charge?

Any substance that impairs your ability to drive can result in a DUI charge:

• Marijuana — including legal recreational use. Being legally allowed to possess marijuana does not mean you can drive while impaired by it.
• Prescription medications — opioids, benzodiazepines (Xanax, Valium), sleep aids (Ambien), muscle relaxants, and certain antidepressants
• Over-the-counter medications — antihistamines, cough suppressants containing DXM, and sleep aids containing diphenhydramine
• Illegal drugs — cocaine, heroin, methamphetamine, ecstasy, PCP, and others
• Combination of drugs and alcohol — even low levels of each can produce impairment when combined

How Drug DUI Cases Differ from Alcohol Cases

Drug DUI cases are fundamentally different from alcohol DWI cases in how impairment is detected and proven.

There is no BAC equivalent for drugs. With alcohol, the state uses a breath test to establish a specific number. With drugs, there is no universally accepted threshold for impairment. THC levels in blood do not correlate with impairment the way BAC correlates with alcohol impairment.

Drug Recognition Experts (DREs). When officers suspect drug impairment, they may call a Drug Recognition Expert to conduct a 12-step evaluation. DREs look for physical signs of drug use — pupil dilation, muscle tone, blood pressure, pulse, and other indicators.

Blood and urine testing. Officers may request a blood or urine sample to detect the presence of drugs. These tests confirm the presence of a substance but often cannot prove when it was consumed or whether it caused impairment at the time of driving.

Defending Drug DUI Cases

Drug DUI cases present unique defense opportunities because the science is less precise than alcohol testing.

Presence Does Not Equal Impairment

Many drugs remain detectable in blood and urine long after their impairing effects wear off. THC can be detected in blood for days after use. Prescription medications may show up for weeks. A positive drug test does not prove you were impaired while driving.

Challenging the DRE Evaluation

The DRE protocol is subjective. Different evaluators can reach different conclusions based on the same observations. We challenge DRE findings by examining whether the evaluation followed proper protocol, whether the officer is properly certified, and whether their conclusions are scientifically supported.

Prescription Medication Defenses

If you were taking a medication prescribed by your doctor, at the prescribed dosage, and were not warned that driving would be unsafe, that context matters. While it may not be a complete defense, it can influence how the court views your case.

We obtain medical records and pharmacy records to establish that you were using medication as directed.

Challenging the Traffic Stop

Just like alcohol DWI cases, the officer needs reasonable suspicion to stop you and probable cause to arrest you. We examine the stated basis for the stop and determine whether it holds up under scrutiny.

Challenging Blood Test Procedures

Blood draws must follow specific chain-of-custody protocols. The sample must be properly collected, stored, and analyzed. Contamination, improper storage, or lab errors can render results unreliable.

Marijuana DUI in New Jersey

Since New Jersey legalized recreational marijuana in 2021, police have focused more resources on marijuana-impaired driving. But proving marijuana impairment is difficult.

THC affects different people differently based on tolerance, frequency of use, and individual physiology. Regular users may have high THC blood levels without any impairment. Occasional users may be impaired with lower levels.

New Jersey has not established a per se THC limit for driving. The state must prove actual impairment, not just the presence of THC. This is a significant defense advantage.

Facing a Drug DUI Charge? Act Now.

Drug DUI cases are complex. The science is contested. The testing is imperfect. These are cases where a knowledgeable defense attorney makes the biggest difference.

Call Papa Alpha & Alpha Law Firm at (201) 555-0100 to schedule your free consultation. We defend clients throughout Springfield, Union County, and New Jersey.