Carolina Criminal Defense & DUI Lawyer UpdatesShould Eyelid Tremor Be Used to Prove Cannabis Impairment in North Carolina?
For years, the Drug Recognition Evaluator (DRE) protocol has relied on a structured set of physical observations to evaluate suspected drug impairment. Among these, the presence of eyelid tremor has been taught as a supposed sign of recent cannabis use. In practice, that means law enforcement officers conducting roadside evaluations or testifying in court may point to an eyelid tremor as evidence supporting probable cause or impairment. But as a recent study published in Clinical Toxicology makes clear, the scientific foundation for this assumption is, at best, unproven. At worst, it is affirmatively misleading.
In a 2024 peer-reviewed clinical research article by George Sam Wang and colleagues, the authors conducted a carefully controlled, blinded study to evaluate whether eyelid tremor could reliably and accurately be identified as a marker of recent cannabis use. The conclusion was clear. Eyelid tremor does not correlate with cannabis ingestion in a scientifically defensible way. Inter-rater reliability was poor to moderate. Specificity was dismal. And perhaps most importantly for DWI defense lawyers, the entire protocol used by officers to “spot” this supposed indicator would not come close to passing scientific muster in any peer-reviewed laboratory setting.
can seek an appeal from district criminal court to Superior Court for a fresh trial. But does this trial de novo appeal truly safeguard the right to a fair trial?
been accused of a crime. But in real life, this idea is often misunderstood. You may hear it said in court, and you might even believe it should protect you. Still, once you’ve been charged, it can feel like the system assumes the opposite.
misdemeanor or a felony, the effects are not limited to fines, probation, or incarceration. A conviction can create long-term barriers that may affect your ability to find housing, secure employment, continue your education, or avoid harsher penalties if you’re ever charged again.
your case isn’t serious or that the charges are minor. It means the criminal justice system is built in a way that often encourages negotiated resolutions instead of courtroom battles.
and medical conditions that could affect impairment assessments. This article examines the different types of experts used in North Carolina DWI cases, how courts determine whether their testimony is admissible under Rule 702, and what legal considerations apply when presenting expert evidence in court.