The criminal offense of driving while intoxicated (DWI) is most often associated with alcohol, hence the term “drunk driving.” It is also an offense under New Jersey’s DWI statute to operate a motor vehicle while under the influence of certain other drugs. While the statute determines the severity of a DWI offense involving alcohol based on several levels of blood alcohol content (BAC), it provides no similar guidance for other drugs. Courts have generally held that expert testimony is required to prove intoxication by certain types of drugs.
New Jersey’s DWI statute defines the offense, in part, as driving “while under the influence of intoxicating liquor, narcotic, hallucinogenic, or habit-producing drug,” or with a BAC of 0.08% or higher. The statute creates two tiers of alcohol intoxication for first offenders. The first tier includes people with a BAC of at least 0.08 percent but less than 0.10 percent, and the second tier includes people with a BAC of 0.10 percent or higher. The second tier also includes anyone under the influence of a “narcotic, hallucinogenic, or habit-producing drug,” regardless of the amount.
Breath tests are not effective at measuring the amount of drugs, as covered by the DWI statute, in a person’s blood stream. Police generally rely on blood or urine tests. Under New Jersey’s implied consent statute, anyone who drives on a public street or road within the state consents to giving samples of breath, blood, or urine for the purposes of enforcing the DWI statute. New Jersey courts have held that chemical test results, expert testimony, and layperson testimony are all relevant to the question of whether a person is “intoxicated” due to drugs. Continue reading →