A positive blood test for drugs does not necessarily mean the State can prove a DWI case.
In a recent case handled by the Law Offices of Christopher Porreca in Mendham Municipal Court, our client was charged with driving while intoxicated following a serious single-vehicle accident in which his vehicle struck a tree. Police subsequently obtained a warrant for a blood sample, and laboratory testing revealed the presence of cocaine.
Despite the positive blood test, the case presented significant problems for the prosecution. After negotiations, the DWI charge was dismissed. Our client ultimately entered a plea to reckless driving with no driver's license suspension, and the remaining summonses were dismissed.
The State Still Has to Prove Impairment
Drug-related DWI cases can be very different from alcohol cases.
Under New Jersey's DWI statute, N.J.S.A. 39:4-50, the prosecution cannot simply point to the presence of a drug and automatically establish that a driver was impaired by that drug while operating a vehicle. The State still bears the burden of proving the elements of the offense beyond a reasonable doubt.
That distinction became particularly important in this case.
Police did not observe our client driving before the accident. There were also no standardized field sobriety tests performed and no traditional roadside testing from which the State could attempt to establish impairment. Instead, the prosecution's case depended substantially upon the circumstances of the accident, observations made afterward, and the subsequent blood-test result.
A Serious Accident Complicated the Officer's Observations
Another important issue was the physical condition of the driver following the collision.
The police reports documented observations concerning our client's demeanor and physical presentation after his vehicle struck a tree. Those observations had to be considered in the context in which they were made: immediately following a significant motor-vehicle accident.
That distinction matters. When the State relies upon a driver's speech, movements, responsiveness, coordination, or demeanor as evidence of intoxication, the defense must examine whether there are other reasonable explanations for those observations.
In an accident case, injury and the physical effects of the collision can become highly relevant to that analysis. The defense therefore challenged the assumption that post-accident observations necessarily demonstrated drug impairment.
No Field Sobriety Tests
The absence of field sobriety testing created another substantial weakness.
Field sobriety tests frequently form an important part of the State's attempt to demonstrate impairment in a DWI prosecution. Here, the State did not have that evidence.
That left an important evidentiary gap between two facts:
There was an accident, and cocaine was subsequently detected in the driver's blood.
Neither fact, standing alone, necessarily answers the central question in a DWI prosecution: Was the defendant actually impaired while operating the vehicle?
That was the issue we focused on in evaluating and negotiating the case.
A Positive Drug Test Is Not the End of the Case
When defending a drug-related DWI charge, it is important to examine precisely what the toxicology evidence establishes—and what it does not.
A laboratory result identifying a substance in a blood sample can be powerful evidence. But the defense must still scrutinize the State's ability to connect that evidence to impairment at the relevant time.
That analysis can include the timing of the blood draw, the substance and compounds actually identified, the laboratory documentation, the observations of the investigating officers, any admissions by the defendant, the circumstances of the accident, and the availability of qualified expert testimony.
The important point is that a positive toxicology result should never be treated as the end of the legal analysis.
The Resolution: DWI Dismissed and No License Suspension
After addressing the evidentiary weaknesses in the State's case with the prosecutor, the parties ultimately reached a resolution.
Our client:
- Did not plead guilty to DWI
- Pleaded guilty to reckless driving
- Received no driver's license suspension
- Had the remaining summonses dismissed
For a client facing a DWI prosecution based upon a positive cocaine blood result following a motor-vehicle accident, avoiding a DWI conviction and retaining his driving privileges represented an excellent resolution.
Drug DWI Cases Require More Than a Lab Report
This case illustrates an important point about New Jersey DWI defense: the existence of damaging evidence does not eliminate the need to examine whether the State can actually prove its case.
A single-car accident looks bad. A positive blood test for cocaine looks worse. Taken together, they can make a case initially appear extremely difficult to defend.
But a defense attorney's job is not to stop at the surface.
Who actually observed the defendant operating the vehicle? What evidence establishes impairment? Were field sobriety tests performed? Were the officer's observations specific to intoxication, or could they have resulted from the accident itself? What does the toxicology evidence actually prove? Can the State reliably connect the laboratory result to impairment at the time of operation?
Those questions ultimately mattered in this Mendham case.
The result was the dismissal of the DWI charge and a resolution to reckless driving without any loss of driving privileges.
The Law Offices of Christopher Porreca represents individuals charged with DWI and other motor-vehicle offenses throughout Morris County and New Jersey. Every case is different, and prior results do not guarantee a similar outcome in another matter.
Accuracy/limitations: This draft is based on the discovery you supplied and the final disposition you just reported. I deliberately avoided stating a specific cocaine concentration or metabolite finding because I cannot confirm those details from the material presently before me. I’d also have Scorpion optimize the published version around phrases such as “Mendham DWI attorney,” “Morris County drug DWI,” “New Jersey cocaine DWI,” and “DWI blood test defense,” without stuffing them into the copy unnaturally.