NH DUID: Driving Under the Influence of Prescription Drugs
As most people know, driving while under the influence of alcohol is a crime in New Hampshire. What many people may not know, however, is that impaired driving caused by prescription drugs is considered a New Hampshire DUID, or driving under the influence of drugs.
But what exactly does “under the influence” mean? In New Hampshire and in every other state, driving with a blood alcohol content (BAC) of 0.08 percent or higher is considered prima facie evidence, or a presumption, that you are under the influence of alcohol. Studies on motorists and alcohol have indicated that most motorists at this level have impaired judgment, and have led legislators to codify this standard into law.
What happens, however, when a person takes a legally prescribed medication, operates a motor vehicle, and is stopped by a police officer for a traffic violation, erratic driving, or some other permissible reason and is suspected of being under the influence?
There are no breath devices, like an intoxilyzer, that can measure the level of, or detect the presence of, a certain drug in your body. Further, there is no uniform standard like there is for alcohol that indicates that a person is unlawfully under the influence of a drug that has impaired his or her driving conduct.
Also, drugs, unlike alcohol, can remain in your system for days or weeks at a time. Even if a drug was detected by a blood or urine test, there is no evidence when you first ingested it, or how long it has been in your system, or that it influenced your driving at the time you were stopped.
Further, impairment by a drug varies according to an individual’s weight, height, the dosage taken, tolerance level, and if it was taken with other drugs.
Driving and Prescription Drugs
Driving under the influence of prescription drugs, or any illegal drug, is a criminal offense and is generally a misdemeanor unless there are aggravating circumstances accompanying the charge that can enhance it to an aggravated DWI or felony.

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