Tag: urine test

CDL Saved After Urine Test Results Suppressed

In the process of saving a CDL from being disqualified, the impaired driving attorneys at GRL exposed a potential flaw in the implied consent advisory for commercial motor vehicles. The advisory provides that commercial driving privileges will be disqualified if the drivers tests over 0.04 for alcohol or refuses testing while operating a CMV. However, it says nothing about a DQ for a positive urine test. So, is a commercial driver’s decision to consent to urine testing reasoned and informed under the circumstances?  We think not. As a result, we were able to not only suppress the urine test, but […]

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Can I be FORCED to provide a breath sample to law enforcement if I am suspected of OWI?

Can I be FORCED to provide a breath sample to law enforcement if I am suspected of OWI? As criminal defense attorneys specializing in OWI defense, we often get questions about what to do if arrested for an OWI.  Many of the questions surround what to do if asked for a sample from your body: If I am suspected of OWI, can the cops require me to give them a breath test? What about a urine or blood test? Can’t I just refuse? I thought I could refuse a test and they just take my license for longer, right? Can […]

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THC Levels Do Not Predict Driving Impairment

The February 5, 2021 issue of Traffic Injury Prevention published results from an Australian study assessing the relationship between THC levels and driving performance.   Volunteers consumed vaporized cannabis samples of varying potencies containing THC, CBD and a placebo.  Blood and saliva samples were collected 30 minutes after inhalation and 3.5 hours later.  Researchers evaluated driving performance on a simulator. Nearly half of the participants failed to show driving impairment after 30 minutes despite showing THC levels above the per se limits, e.g., 5 ng/ml.  Several participants did show impairment at the 3.5 hour mark, but their THC levels were below […]

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GRL Saves CDL with DOT WIN

The drug defense attorneys at GRL Law prove once again that preparation is everything when it comes to implied consent testing and DOT administrative hearings.  This is especially true when it involves professional CDL drivers and forensic drug testing. In this case, a DOT officer assigned to an I-35 weigh station in North Iowa believed he had reasonable grounds to invoke implied consent and request a urine sample under Iowa Code section 321J.6 based on the discovery of a small amount of marijuana and an admission to smoking the previous evening.  When the sample came back positive for non-impairing metabolites […]

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Suppression of Urine Test Result Leads to OWI Dismissal WIN

Northwood, Worth County, Iowa.  The district court in Worth County granted the State’s motion to dismiss the charge of OWI, but not before suppressing the results of a urine test. A thorough review of traffic stop and implied consent videos revealed several issues that were briefed by the drugged driving attorneys at GRL Law, including whether: The deputy lacked reasonable suspicion to detain the driver; The deputy unreasonably prolonged the traffic stop to await a drug dog; The drug dog trespassed onto the vehicle turning the “free air sniff” into an unreasonable search; The handler cued the drug dog to […]

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THC Metabolites Detected in Urine Following Full-Spectrum CBD Use

The November 4, 2020 issue of JAMA Psychiatry published results from a recent study examining whether the use of full-spectrum CBD from legal hemp (< 0.30% Δ9-THC) would lead to positive urine test results for THC metabolites. It has been often assumed that hemp-derived cannabidiol products will test negative for urinary THC.  However, the study showed that half of subjects tested positive for carboxy-THC, an inactive metabolite of Δ9-THC, after four weeks of daily use.  Samples were initially screened through urine drug assays.  Positive screens were confirmed through gas chromatography-mass spectroscopy. The results suggest that individuals consistently using full-spectrum, hemp-derived […]

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Yes, Drug Testing Methods Can Mistake Hemp-Derived CBD for THC

I recently came across a little-known study published in the Journal of Analytical Toxicology that raises serious questions regarding whether the gold standard in forensic urine testing could mistake hemp-derived CBD for THC. Many laboratories include derivatization as a part of their sample preparation for analysis by gas chromatography – mass spectroscopy (GC-MS).  Derivatization is the process by which a compound is changed chemically so that it has properties that are more amenable to a particular analytical method.  Essentially, the new compound becomes more suitable for detection and analysis. Researchers discovered trifluoracetic anhydride (TFAA), a common derivatizing agent used in GC-MS […]

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